Full Scale Lab 4 Task 4.1 Problem

I'm getting issues trying to get this to work.

 

It seems that traffic from the VRF FOO on R1 router is able to get to R5 and R2 and even XR2 without a problem :

 

---- snip -----

R1#ping vrf FOO 172.16.0.5

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.16.0.5, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms

R1#ping vrf FOO 172.16.0.2

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.16.0.2, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/6/20 ms

Success rate is 0 percent (0/5)

R1#ping vrf FOO 172.16.0.20

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.16.0.20, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms

R1#

---- snip ----


However , traffic from R1 (or any source at all) is unable to reach XR1 :

 

R1#ping vrf FOO 172.16.0.19

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.16.0.19, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

R1#

R1#traceroute 10.0.0.19 source lo0

Type escape sequence to abort.

Tracing the route to 10.0.0.19

 

  1 10.0.13.3 [MPLS: Label 23 Exp 0] 0 msec 0 msec 0 msec

  2  *  *  * 

  3 

R1#

 

R2#ping vrf FOO 172.16.0.19

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 172.16.0.19, timeout is 2 seconds:

.....

Success rate is 0 percent (0/5)

R2#

R2#traceroute vrf FOO 172.16.0.19

Type escape sequence to abort.

Tracing the route to 172.16.0.19

 

  1  *  *  * 

  2 10.0.195.19 4 msec *  4 msec

The strangest this is this traceroute working

---- snip ---- 

 

Further investigation shows that not even IPv4 Label Switched Path is working 

 

R1#ping 10.0.0.19 source lo0

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.0.0.19, timeout is 2 seconds:

Packet sent with a source address of 10.0.0.1 

.....

Success rate is 0 percent (0/5)

R1#

 

Altough switched path seems OK.

 

R1#sh ip route 10.0.0.19

Routing entry for 10.0.0.19/32

  Known via "ospf 2000", distance 110, metric 1

  Tag 1000, type extern 2, forward metric 1

  Last update from 10.0.13.3 on FastEthernet0/0.13, 00:54:18 ago

  Routing Descriptor Blocks:

  * 10.0.13.3, from 10.0.0.3, 00:54:18 ago, via FastEthernet0/0.13

      Route metric is 1, traffic share count is 1

      Route tag 1000

 

 

R1#sh mpls forwarding-table 10.0.0.19   

Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop    

Label      Label      or Tunnel Id     Switched      interface              

22         23         10.0.0.19/32     0             Fa0/0.13   10.0.13.3   

R1#

 

R3#sh mpls forwarding-table 10.0.0.19

Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop    

Label      Label      or Tunnel Id     Switched      interface              

23         Pop Label  10.0.0.19/32     6184          Fa0/0.193  10.0.193.19 

R3#

 

XR1 LSP towards R1

 

RP/0/0/CPU0:XR1#sh mpls forwarding prefix 10.0.0.1/32

Sat Feb 12 22:35:14.972 UTC

Local  Outgoing    Prefix             Outgoing     Next Hop        Bytes       

Label  Label       or ID              Interface                    Switched    

------ ----------- ------------------ ------------ --------------- ------------

16008  16006       10.0.0.1/32        PO0/6/0/0.1920 10.19.20.20     1280        

RP/0/0/CPU0:XR1#

 

XR1 is using XR2 to route back the packet , wich is strange, because it's redistributing the BGP learnt routes from R3, but anyway the LSP seems OK.

 

RP/0/3/CPU0:XR2#sh mpls forwarding prefix 10.0.0.1/32

Sat Feb 12 23:08:15.013 UTC

Local  Outgoing    Prefix             Outgoing     Next Hop        Bytes       

Label  Label       or ID              Interface                    Switched    

------ ----------- ------------------ ------------ --------------- ------------

16006  23          10.0.0.1/32        Gi0/4/0/0.220 10.0.220.2      3224        

RP/0/3/CPU0:XR2#

 

R2#sh mpls forwarding-table 10.0.0.1

Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop    

Label      Label      or Tunnel Id     Switched      interface              

23         25         10.0.0.1/32      7482          Fa0/0.25   10.0.25.5   

R2#

 

R5#sh mpls forwarding-table 10.0.0.1

Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop    

Label      Label      or Tunnel Id     Switched      interface              

25         17         10.0.0.1/32      14868         Fa0/0.35   10.0.35.3

 

R3#sh mpls forwarding-table 10.0.0.1 

Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop    

Label      Label      or Tunnel Id     Switched      interface              

17         Pop Label  10.0.0.1/32      18660         Fa0/0.13   10.0.13.1   

R3#

 

---- snip ---- 

 

It only works when i set the metric of the POS link between XR1-XR2 to a higher metric, making XR1 to go to R3 to get to R1.

 

RP/0/0/CPU0:XR1#ping 10.0.0.1 source lo0

Sat Feb 12 23:23:25.220 UTC

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 10.0.0.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 3/20/40 ms

RP/0/0/CPU0:XR1#

 

RP/0/0/CPU0:XR1#sh mpls forwarding prefix 10.0.0.1/32

Sat Feb 12 23:23:56.014 UTC

Local  Outgoing    Prefix             Outgoing     Next Hop        Bytes       

Label  Label       or ID              Interface                    Switched    

------ ----------- ------------------ ------------ --------------- ------------

16008  25          10.0.0.1/32        Gi0/1/0/0.195 10.0.195.5      1040        

RP/0/0/CPU0:XR1#

 

R5#sh mpls forwarding-table 10.0.0.1

Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop    

Label      Label      or Tunnel Id     Switched      interface              

25         17         10.0.0.1/32      17958         Fa0/0.35   10.0.35.3   

R5#

 

---- snip ---- 

 

Something odd seems to be happening since not even the mpls forwarding count for the 10.0.0.1 prefix is being changed on R2, not even being received or being shown on debug mpls packets ...

 

R2#sh mpls forwarding-table 

Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop    

Label      Label      or Tunnel Id     Switched      interface              

16         16002      10.0.0.5/32      0             Fa0/0.220  10.0.220.20 

17         16001      10.0.195.0/24    0             Fa0/0.220  10.0.220.20 

18         Pop Label  10.0.205.0/24    0             Fa0/0.220  10.0.220.20 

19         Pop Label  10.19.20.0/24    0             Fa0/0.220  10.0.220.20 

20         20         10.0.0.19/32     0             Fa0/0.25   10.0.25.5   

21         21         10.0.0.20/32     0             Fa0/0.25   10.0.25.5   

22         Pop Label  172.16.0.2/32[V] 5724          aggregate/FOO 

23         25         10.0.0.1/32      9962          Fa0/0.25   10.0.25.5   ----> Does not change the counter , debug mpls shows nothing

24         16007      10.0.0.3/32      0             Fa0/0.220  10.0.220.20 

25         16008      10.0.0.4/32      0             Fa0/0.220  10.0.220.20 

 

it's like XR2 isn't sending the packets

 

the configs looks exactly the same as the workbooks , with the addition of the ebgp multihop mpls.

 

Could someone please point me on some directions ?

 

Comments

  • Have you had a goo here? Very popular task is 4.1 these days :)

    http://ieoc.com/forums/t/25104.aspx

  • This only works if i shut down the XR1-XR2 link. Then everyting works.

  • Looks like some problem in your R3-XR1 communication, XR1 should have a route to 10.0.0.1 via R3, not via XR2.

     

    Can you verify that you're actually receiving 10.0.0.1 via eBGP from R3 on XR1?

  • RP/0/0/CPU0:XR1#sh mpls forwarding 

    Sun Feb 13 01:10:17.541 UTC

    Local  Outgoing    Prefix             Outgoing     Next Hop        Bytes       

    Label  Label       or ID              Interface                    Switched    

    ------ ----------- ------------------ ------------ --------------- ------------

    16000  21          10.0.0.20/32       Gi0/1/0/0.195 10.0.195.5      214         

    16001  Pop         10.0.193.3/32      Gi0/1/0/0.193 10.0.193.3      4665        

    16002  17          10.0.0.2/32        Gi0/1/0/0.195 10.0.195.5      151         

    16003  Pop         10.0.0.5/32        Gi0/1/0/0.195 10.0.195.5      106         

    16004  18          10.0.220.0/24      Gi0/1/0/0.195 10.0.195.5      0           

    16005  Pop         10.0.25.0/24       Gi0/1/0/0.195 10.0.195.5      0           

    16006  Pop         10.0.205.0/24      Gi0/1/0/0.195 10.0.195.5      0           

    16007  Pop         10.0.0.3/32        Gi0/1/0/0.193 10.0.193.3      0           

    16008  16          10.0.0.4/32        Gi0/1/0/0.193 10.0.193.3      520         

    16009  Aggregate   FOO: Per-VRF Aggr[V]  

                                          FOO                          1560        

    16010  25          10.0.0.1/32        Gi0/1/0/0.195 10.0.195.5      0           

    16011  19          10.19.20.0/24      Gi0/1/0/0.195 10.0.195.5      0 

     

    when i do a sh bgp summ in XR1 it does not show anything being learnt from R3, even if I remove all route-maps.

     

    this is so weird, also i tried redistributing on Level-2 on R5 instead of level-1, and i seems to get me more connectivity.

    If anyone is able to help i could pay, we can arrange a skype session, this is getting on my nerves

  • First of your problems is that XR1 isnt learning the routes from R3 then. Post your BGP configs between R3 and XR1.

  • I've had reenable the ipv4 unicast since enabling ipv4 labelled unicast disables it.

    Also i've added ebgp multihop 255 mpls to XR2.

     

    The ONLY way this works is by shutting XR1-XR2 connection.

     

    But still nobody can access XR1 VRF FOO not even R5. this is so freaky.

     

     

  •  Post your BGP configs between R3 and XR1.

     

  • XR1 BGP Config 

    -=-=-=-=

    router bgp 1000

     address-family ipv4 unicast

      network 10.0.0.2/32

      network 10.0.0.5/32

      network 10.0.0.19/32

      network 10.0.0.20/32

      allocate-label all

     !

     address-family vpnv4 unicast

     !

     address-family ipv6 unicast

      network 2001:10::19/128

     !

     neighbor 10.0.0.2

      remote-as 1000

      update-source Loopback0

      address-family ipv4 unicast

       next-hop-self

      !

     !

     neighbor 10.0.0.20

      remote-as 1000

      update-source Loopback0

      address-family vpnv4 unicast

      !

     !

     neighbor 10.0.193.3

      remote-as 2000

      address-family ipv4 unicast

       send-community-ebgp

       route-policy PASS in

       route-policy PASS out

       soft-reconfiguration inbound always

      !

      address-family ipv4 labeled-unicast

       send-community-ebgp

       route-policy PASS in

       route-policy PASS out

       soft-reconfiguration inbound always

      !

     !

     neighbor 2001:10::2

      remote-as 1000

      update-source Loopback0

      address-family ipv6 unicast

       route-reflector-client

       next-hop-self

      !

     !

     neighbor 2001:10::5

      remote-as 1000

      update-source Loopback0

      address-family ipv6 unicast

       route-reflector-client

       next-hop-self

      !

     !

     neighbor 2001:10::20

      remote-as 1000

      update-source Loopback0

      address-family ipv6 unicast

       route-reflector-client

       next-hop-self

      !

     !

     neighbor 2001:10:0:193::3

      remote-as 2000

      address-family ipv6 unicast

       route-policy PASS in

       route-policy IPV6_TO_R3 out

      !

     !

     vrf FOO

      rd 10.0.0.19:1

      address-family ipv4 unicast

       network 172.16.0.19/32

    -=-=-=-=-

     

    R3 BGP Config

     

    router bgp 2000

     no bgp default ipv4-unicast

     bgp log-neighbor-changes

     neighbor 10.0.0.1 remote-as 2000

     neighbor 10.0.0.1 update-source Loopback0

     neighbor 10.0.0.4 remote-as 2000

     neighbor 10.0.0.4 update-source Loopback0

     neighbor 10.0.35.5 remote-as 1000

     neighbor 10.0.193.19 remote-as 1000

     neighbor 2001:10::1 remote-as 2000

     neighbor 2001:10::1 update-source Loopback0

     neighbor 2001:10::4 remote-as 2000

     neighbor 2001:10::4 update-source Loopback0

     neighbor 2001:10:0:35::5 remote-as 1000

     neighbor 2001:10:0:193::19 remote-as 1000

     !

     address-family ipv4

      no synchronization

      network 10.0.0.1 mask 255.255.255.255

      network 10.0.0.3 mask 255.255.255.255

      network 10.0.0.4 mask 255.255.255.255

      neighbor 10.0.0.1 activate

      neighbor 10.0.0.1 send-community

      neighbor 10.0.0.1 next-hop-self

      neighbor 10.0.35.5 activate

      neighbor 10.0.35.5 send-community

      neighbor 10.0.35.5 soft-reconfiguration inbound

      neighbor 10.0.35.5 route-map RFC_1998 in

      neighbor 10.0.35.5 route-map TO_R5 out

      neighbor 10.0.35.5 send-label

      neighbor 10.0.193.19 activate

      neighbor 10.0.193.19 send-community

      neighbor 10.0.193.19 soft-reconfiguration inbound

      neighbor 10.0.193.19 route-map RFC_1998 in

      neighbor 10.0.193.19 send-label

      no auto-summary

     exit-address-family

     

     

     

  • RP/0/0/CPU0:Feb 13 06:53:12.414 : exec[65704]: %SECURITY-login-6-AUTHEN_SUCCESS : Successfully authenticated user 'xr1' from 'console' on 'con0_0_CPU0' 

    RP/0/0/CPU0:XR1#sh ip bgp sum 

    Sun Feb 13 06:54:19.318 UTC

    BGP router identifier 10.0.0.19, local AS number 1000

    BGP generic scan interval 60 secs

    BGP table state: Active

    Table ID: 0xe0000000

    BGP main routing table version 10

    BGP scan interval 60 secs

     

    BGP is operating in STANDALONE mode.

     

     

    Process       RcvTblVer   bRIB/RIB   LabelVer  ImportVer  SendTblVer  StandbyVer

    Speaker              10         10         10         10          10          10

     

    Neighbor        Spk    AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down  St/PfxRcd

    10.0.0.2          0  1000      18      16       10    0    0 00:08:39          5

    10.0.193.3        0  2000      16      14       10    0    0 00:08:53          0

     

    RP/0/0/CPU0:XR1#

     

    0 prefixes from r3 via ipv4 unicast but,

     

     

    Neighbor        Spk    AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down  St/PfxRcd

    10.0.193.3        0  2000      17      15       10    0    0 00:09:58          3

     

    RP/0/0/CPU0:XR1#

     

    3 from labelled unicast 

  • This is getting better, take a look :

    VRF FOO conectivity test from XR1 to XR2 (OK)

     

    RP/0/0/CPU0:XR1#ping vrf FOO 172.16.0.20 

    Sun Feb 13 07:05:45.365 UTC

    Type escape sequence to abort.

    Sending 5, 100-byte ICMP Echos to 172.16.0.20, timeout is 2 seconds:

    !!!!!

    Success rate is 100 percent (5/5), round-trip min/avg/max = 2/2/4 ms

     

    RP/0/0/CPU0:XR1#show cef vrf FOO 172.16.0.20

    Sun Feb 13 07:05:53.623 UTC

    172.16.0.20/32, version 1, internal 0x40040001 (ptr 0x9cd5c798) [1], 0x0 (0x0), 0x4100 (0x9d5220c8)

     Updated Feb 13 06:47:25.621

     Prefix Len 32, traffic index 0, precedence routine (0)

       via 10.0.0.20, 3 dependencies, recursive [flags 0x10]

        next hop VRF - 'default', table - 0xe0000000

        next hop 10.0.0.20 via 16015/0/21

         next hop 10.0.195.5      Gi0/1/0/0.195 labels imposed {22 16017}

     

    RP/0/0/CPU0:XR1#sh mpls forwarding 

    Sun Feb 13 07:06:07.097 UTC

    Local  Outgoing    Prefix             Outgoing     Next Hop        Bytes       

    Label  Label       or ID              Interface                    Switched    

    ------ ----------- ------------------ ------------ --------------- ------------

    16009  Pop         10.0.193.3/32      Gi0/1/0/0.193 10.0.193.3      2623        

    16010  16          10.0.0.2/32        Gi0/1/0/0.195 10.0.195.5      2558        

    16011  Pop         10.0.0.5/32        Gi0/1/0/0.195 10.0.195.5      2756        

    16012  17          10.0.220.0/24      Gi0/1/0/0.195 10.0.195.5      0           

    16013  Pop         10.0.25.0/24       Gi0/1/0/0.195 10.0.195.5      0           

    16014  Pop         10.0.205.0/24      Gi0/1/0/0.195 10.0.195.5      0           

    16015  22          10.0.0.20/32       Gi0/1/0/0.195 10.0.195.5      3859        --> Transport Label OK

    16017  16          10.0.0.4/32        Gi0/1/0/0.193 10.0.193.3      0           

    16018  Pop         10.0.0.3/32        Gi0/1/0/0.193 10.0.193.3      0           

    16019  23          10.0.0.1/32        Gi0/1/0/0.195 10.0.195.5      520         

    16020  Aggregate   FOO: Per-VRF Aggr[V]  

                                          FOO                          520         

    RP/0/3/CPU0:XR2#sh mpls forwarding 

    Sun Feb 13 07:07:58.559 UTC

    Local  Outgoing    Prefix             Outgoing     Next Hop        Bytes       

    Label  Label       or ID              Interface                    Switched    

    ------ ----------- ------------------ ------------ --------------- ------------

    16009  Pop         10.0.0.2/32        Gi0/4/0/0.220 10.0.220.2      6174        

    16010  Pop         10.0.25.0/24       Gi0/4/0/0.220 10.0.220.2      0           

    16011  20          10.0.0.19/32       Gi0/4/0/0.205 10.0.205.5      4863        

    16012  Pop         10.0.0.5/32        Gi0/4/0/0.205 10.0.205.5      11907       

    16013  Pop         10.0.195.0/24      Gi0/4/0/0.205 10.0.205.5      0           

    16014  25          10.0.0.4/32        Gi0/4/0/0.205 10.0.205.5      3218        

    16015  24          10.0.0.3/32        Gi0/4/0/0.205 10.0.205.5      0           

    16016  23          10.0.0.1/32        Gi0/4/0/0.205 10.0.205.5      540         

    16017  Aggregate   FOO: Per-VRF Aggr[V]    --> VPN Label OK too

                                          FOO                          1560        

    RP/0/3/CPU0:XR2#

     

    -=-=-=-=-=-=-=-

     

    Ping from XR2 to XR1 

     

    RP/0/3/CPU0:XR2#ping vrf FOO 172.16.0.19

    Sun Feb 13 07:04:40.317 UTC

    Type escape sequence to abort.

    Sending 5, 100-byte ICMP Echos to 172.16.0.19, timeout is 2 seconds:

    ..... -->> Fails WTF 

    Success rate is 0 percent (0/5)

     

    RP/0/3/CPU0:XR2#show cef vrf FOO 172.16.0.19

    Sun Feb 13 07:07:27.250 UTC

    172.16.0.19/32, version 1, internal 0x40040001 (ptr 0x9cd5c798) [1], 0x0 (0x0), 0x4100 (0x9d522398)

     Updated Feb 13 06:47:25.988

     Prefix Len 32, traffic index 0, precedence routine (0)

       via 10.0.0.19, 3 dependencies, recursive [flags 0x10]

        next hop VRF - 'default', table - 0xe0000000

        next hop 10.0.0.19 via 16011/0/21

         next hop 10.0.205.5      Gi0/4/0/0.205 labels imposed {20 16020} --> transport and vpn labels ok

    RP/0/3/CPU0:XR2#sh mpls forwarding 

    Sun Feb 13 07:07:58.559 UTC

    Local  Outgoing    Prefix             Outgoing     Next Hop        Bytes       

    Label  Label       or ID              Interface                    Switched    

    ------ ----------- ------------------ ------------ --------------- ------------

    16009  Pop         10.0.0.2/32        Gi0/4/0/0.220 10.0.220.2      6174        

    16010  Pop         10.0.25.0/24       Gi0/4/0/0.220 10.0.220.2      0           

    16011  20          10.0.0.19/32       Gi0/4/0/0.205 10.0.205.5      4863        

    16012  Pop         10.0.0.5/32        Gi0/4/0/0.205 10.0.205.5      11907       

    16013  Pop         10.0.195.0/24      Gi0/4/0/0.205 10.0.205.5      0           

    16014  25          10.0.0.4/32        Gi0/4/0/0.205 10.0.205.5      3218        

    16015  24          10.0.0.3/32        Gi0/4/0/0.205 10.0.205.5      0           

    16016  23          10.0.0.1/32        Gi0/4/0/0.205 10.0.205.5      540         

    16017  Aggregate   FOO: Per-VRF Aggr[V]  

                                          FOO                          1560  

     

    R5 MPLS FW TABLE

     

    R5#sh mpls forwarding-table 

    Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop    

    Label      Label      or Tunnel Id     Switched      interface              

    16         Pop Label  10.0.0.2/32      5504          Fa0/0.25   10.0.25.2   

    17         Pop Label  10.0.220.0/24    0             Fa0/0.25   10.0.25.2   

    18         Pop Label  10.0.35.3/32     0             Fa0/0.35   10.0.35.3   

    19         Pop Label  10.19.20.0/24    0             Fa0/0.195  10.0.195.19 

               Pop Label  10.19.20.0/24    0             Fa0/0.205  10.0.205.20 

    20         Pop Label  10.0.0.19/32     15231         Fa0/0.195  10.0.195.19 

    21         Pop Label  172.16.0.5/32[V] 500           aggregate/FOO 

    22         Pop Label  10.0.0.20/32     24098         Fa0/0.205  10.0.205.20 

    23         17         10.0.0.1/32      1240          Fa0/0.35   10.0.35.3   

    24         16018      10.0.0.3/32      0             Fa0/0.195  10.0.195.19 

    25         16         10.0.0.4/32      5161          Fa0/0.35   10.0.35.3   

    R5#

  • Since you are now actually receiving the three prefixed from R3 to XR1, this is probably not the problem.

    16017  16          10.0.0.4/32        Gi0/1/0/0.193 10.0.193.3      0 <- from your XR1 sh mpls forward output

  • Can you put a trace ip and trace mpls from XR2 to XR1 in here?

    Also this maybe silly but have yuo enabled mpls oam on XR2 but not XR1?

  • I started all over again :

    Just before the 4.1 Task , the XR1 had the prefixes from R3 com ipv4 bgp table :

    RP/0/0/CPU0:XR1#sh ip bgp sum 

    Wed Sep 25 12:17:05.486 UTC

    BGP router identifier 10.0.0.19, local AS number 1000

    BGP generic scan interval 60 secs

    BGP table state: Active

    Table ID: 0xe0000000

    BGP main routing table version 9

    BGP scan interval 60 secs

     

    BGP is operating in STANDALONE mode.

     

     

    Process       RcvTblVer   bRIB/RIB   LabelVer  ImportVer  SendTblVer  StandbyVer

    Speaker               9          9          9          9           9           9

     

    Neighbor        Spk    AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down  St/PfxRcd

    10.0.0.2          0  1000      33      30        9    0    0 00:21:28          4

    10.0.193.3        0  2000      36      28        9    0    0 00:21:47          3

     

    RP/0/0/CPU0:XR1#

     

    I then redistributed these prefixes in ISIS via the configuration on the workbook but with the following command

     

    router isis 1000

     is-type level-2-only

     net 49.0019.0000.0000.0019.00

     address-family ipv4 unicast

      redistribute bgp 1000 level-2 metric 1 route-policy BGP_TO_IGP metric-type external

     

    I can see that the XR1 has put these on it's ISIS database :

     

    XR1.00-00           * 0x00000007   0xc1e3        1145            0/0/0

      Area Address: 49.0019

      NLPID:        0xcc

      NLPID:        0x8e

      Hostname:     XR1

      IP Address:   10.0.0.19

      IPv6 Address: 2001:10::19

      Metric: 10         IS R5.02

      Metric: 10         IS XR2.00

      Metric: 0          IP 10.0.0.19/32

      Metric: 10         IP 10.0.195.0/24

      Metric: 10         IP 10.19.20.0/24

      Metric: 65         IP-External 10.0.0.3/32

      Metric: 65         IP-External 10.0.0.4/32

      Metric: 0          IPv6 2001:10::19/128

      Metric: 10         IPv6 2001:10:0:195::/64

      Metric: 10         IPv6 2001:10:19:20::/64

     

    Shouldn't it be advertising 10.0.0.1 too ? I know it's being prefereed over R5 route, but even so, i guess it should have advertise it too.

     

    Here is XR2 mpls fw table : 

    RP/0/3/CPU0:XR2#sh mpls forwarding 

    Wed Sep 25 12:15:59.583 UTC

    Local  Outgoing    Prefix             Outgoing     Next Hop        Bytes       

    Label  Label       or ID              Interface                    Switched    

    ------ ----------- ------------------ ------------ --------------- ------------

    16000  Pop         10.0.0.19/32       PO0/7/0/0.1920 10.19.20.19     2783        

    16001  Pop         10.0.195.0/24      Gi0/4/0/0.205 10.0.205.5      0           

           Pop         10.0.195.0/24      PO0/7/0/0.1920 10.19.20.19     0           

    16002  Pop         10.0.0.5/32        Gi0/4/0/0.205 10.0.205.5      8590        

    16003  Pop         10.0.25.0/24       Gi0/4/0/0.220 10.0.220.2      0           

    16004  Pop         10.0.0.2/32        Gi0/4/0/0.220 10.0.220.2      5164        

    16005  Unlabelled  10.0.0.4/32        PO0/7/0/0.1920 10.19.20.19     0           

    16006  Unlabelled  10.0.0.3/32        PO0/7/0/0.1920 10.19.20.19     0    

     

    Unlabelled ?

  • my XR2 is giving me this error 

     

    RP/0/3/CPU0::Sep 25 12:35:48.177 : ipv4_io[258]: ip_icmp_lib_io:  pulse code 5 received

    RP/0/3/CPU0::Sep 25 12:35:48.179 : ipv4_io[258]: ipv4_icmp_error_trigger: type: 3, code: 2 

    RP/0/3/CPU0::Sep 25 12:35:48.181 : ipv4_io[258]: Preroute for pak e30ea3ab to i/f GigabitEthernet0/4/0/0.208 requested

    RP/0/3/CPU0::Sep 25 12:35:48.181 : ipv4_io[258]: Sending pak e30ea3ab to NetIO towards i/f GigabitEthernet0/4/0/0.208

     

    wich is strange since I'm not using this interface.

     

    Plus same issue, i can ping from XR1 to XR2 FOO loopback but not the other way around.

    CEF, labels and routes all seem ok !

     

    I would really apreciate if someone could take a deeper look at this , i could arrange a skype session many many tks

  • Found what is causing the issue.

    When R2 tries to ping XR2 , it replies as usual, no problem

     

    R2#ping vrf FOO 172.16.0.20           

    Type escape sequence to abort.

    Sending 5, 100-byte ICMP Echos to 172.16.0.20, timeout is 2 seconds:

    !!!!!

    Success rate is 100 percent (5/5), round-trip min/avg/max = 4/5/8 ms

    R2#

    LC/0/4/CPU0::Sep 25 12:59:44.033 : ipv4_io[182]: Async msg code = <0>

    LC/0/4/CPU0::Sep 25 12:59:44.034 : ipv4_io[182]: ip_icmp_lib_io:  pulse code 0 received

    LC/0/4/CPU0::Sep 25 12:59:44.034 : ipv4_io[182]: ip_icmp_lib_ipv4_netio_input: code 0

    LC/0/4/CPU0::Sep 25 12:59:44.035 : ipv4_io[182]: ip_icmp_lib_ipv4_receive: Receiving

    LC/0/4/CPU0::Sep 25 12:59:44.035 : ipv4_io[182]: IPv4 ICMP: GigabitEthernet0/4/0/0.205: Received echo request from 172.16.0.2

    LC/0/4/CPU0::Sep 25 12:59:44.036 : ipv4_io[182]: IPv4 ICMP: GigabitEthernet0/4/0/0.205: Sending echo reply to 172.16.0.2

    LC/0/4/CPU0::Sep 25 12:59:44.036 : ipv4_io[182]: Sending

     

    But when XR2 tries to ping anything :

    RP/0/3/CPU0:XR2#ping vrf FOO 172.16.0.19

    Wed Sep 25 13:02:49.168 UTC

    Type escape sequence to abort.

    Sending 5, 100-byte ICMP Echos to 172.16.0.19, timeout is 2 seconds:

    .....

     

    RP/0/3/CPU0:XR2#sh logging 

    Wed Sep 25 13:03:02.088 UTC

    Syslog logging: enabled (15 messages dropped, 0 flushes, 0 overruns)

        Console logging: level informational, 473 messages logged

        Monitor logging: level debugging, 0 messages logged

        Trap logging: level informational, 0 messages logged

        Buffer logging: level debugging, 9922 messages logged

     

    Log Buffer (131072 bytes):

     

    RP/0/3/CPU0::Sep 25 13:02:47.927 : ipv4_io[258]: Async msg code = <5>

    RP/0/3/CPU0::Sep 25 13:02:47.927 : ipv4_io[258]: ip_icmp_lib_io:  pulse code 5 received

    RP/0/3/CPU0::Sep 25 13:02:47.928 : ipv4_io[258]: ipv4_icmp_error_trigger: type: 3, code: 2 

    RP/0/3/CPU0::Sep 25 13:02:47.929 : ipv4_io[258]: Preroute for pak e31c126b to i/f GigabitEthernet0/4/0/0.207 requested

    RP/0/3/CPU0::Sep 25 13:02:47.930 : ipv4_io[258]: Sending pak e31c126b to NetIO towards i/f GigabitEthernet0/4/0/0.207

    RP/0/3/CPU0::Sep 25 13:02:49.471 : ipv4_io[258]: IPv4 ICMP: Sending icmp echo request to 172.16.0.19

    RP/0/3/CPU0::Sep 25 13:02:50.398 : ipv4_io[258]: Async msg code = <5>

    RP/0/3/CPU0::Sep 25 13:02:50.398 : ipv4_io[258]: ip_icmp_lib_io:  pulse code 5 received

    RP/0/3/CPU0::Sep 25 13:02:50.399 : ipv4_io[258]: ipv4_icmp_error_trigger: type: 3, code: 2 

    RP/0/3/CPU0::Sep 25 13:02:50.400 : ipv4_io[258]: Preroute for pak e30f856b to i/f GigabitEthernet0/4/0/0.208 requested

    RP/0/3/CPU0::Sep 25 13:02:50.401 : ipv4_io[258]: Sending pak e30f856b to NetIO towards i/f GigabitEthernet0/4/0/0.208

    RP/0/3/CPU0::Sep 25 13:02:51.472 : ipv4_io[258]: IPv4 ICMP: Sending icmp echo request to 172.16.0.19

    RP/0/3/CPU0::Sep 25 13:02:52.217 : ipv4_io[258]: Async msg code = <5>

    RP/0/3/CPU0::Sep 25 13:02:52.217 : ipv4_io[258]: ip_icmp_lib_io:  pulse code 5 received

    RP/0/3/CPU0::Sep 25 13:02:52.218 : ipv4_io[258]: ipv4_icmp_error_trigger: type: 3, code: 2 

    RP/0/3/CPU0:XR2#

     

    WTF!?!!?!?! i don't even have this interface !! 

  • Label  Label       or ID              Interface                    Switched    

    ------ ----------- ------------------ ------------ --------------- ------------

    16000  Pop         10.0.0.19/32       PO0/7/0/0.1920 10.19.20.19     2783        

    16001  Pop         10.0.195.0/24      Gi0/4/0/0.205 10.0.205.5      0           

           Pop         10.0.195.0/24      PO0/7/0/0.1920 10.19.20.19     0           

    16002  Pop         10.0.0.5/32        Gi0/4/0/0.205 10.0.205.5      8590        

    16003  Pop         10.0.25.0/24       Gi0/4/0/0.220 10.0.220.2      0           

    16004  Pop         10.0.0.2/32        Gi0/4/0/0.220 10.0.220.2      5164        

    16005  Unlabelled  10.0.0.4/32        PO0/7/0/0.1920 10.19.20.19     0           

    16006  Unlabelled  10.0.0.3/32        PO0/7/0/0.1920 10.19.20.19     0    

     

    Unlabelled ?

    I also got the same result like yours...  :(   I am sorry. Till now, I could not solve it and I left it alone by thinking I should not waste time on this silly issue.  But, I am still afraid if I will meet the same problem in the exam.

  • I dunno, this seems like a broken box.

    Anyway I was trying to compile a list of known CCIESP Gotchas.

    Since it seems to be a lot. i will be posting them soon .

    If you have any please complete the post.

     

    thanks

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