5.1 BGP neighbor

Hi,

Switch SW1 and R5 connectivity is not working. I have enabled dot1q to make this work. Any comment will help.

BEFORE---

SW1#sh run int fa 1/0/1
Building configuration...

Current configuration : 96 bytes
!
interface FastEthernet1/0/1
 end

SW1#sh ip bgp sum
BGP router identifier 150.1.7.7, local AS number 200
BGP table version is 1, main routing table version 1

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
136.1.57.5      4   200       0       0        0    0    0 never    Active
SW1#SW1#sh ip int b
Interface              IP-Address      OK? Method Status                Protocol
Vlan1                  unassigned      YES unset  up                    up     
Vlan7                  136.1.7.7       YES manual down                  down   
Vlan57                 136.1.57.7      YES manual up                    up     
FastEthernet1/0/1      unassigned      YES unset  up                    up     
FastEthernet1/0/2      unassigned      YES unset  down                  down   
FastEthernet1/0/3      unassigned      YES unset  down                  down

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

R5#sh ip int b
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            192.10.1.5      YES NVRAM  up                    up     
Serial0/0                  unassigned      YES NVRAM  up                    up     
Serial0/0.15               136.1.15.5      YES NVRAM  up                    up     
Serial0/0.245              136.1.245.5     YES NVRAM  up                    up     
FastEthernet0/1            136.1.57.5      YES NVRAM  up                    up     
Serial0/1                  136.1.45.5      YES NVRAM  up                    up     
Loopback0                  150.1.5.5       YES NVRAM  up                    up     
R5#ping 136.1.57.7

Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 136.1.57.7, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)
R5#

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

After creating sub-interface in R5.

R5#sh run int fa 0/1.1
Building configuration...

Current configuration : 96 bytes
!
interface FastEthernet0/1.1
 encapsulation dot1Q 57
 ip address 136.1.57.5 255.255.255.0
end

R5#sh ip bgp sum
BGP router identifier 150.1.5.5, local AS number 200
BGP table version is 11, main routing table version 11
10 network entries using 1170 bytes of memory
20 path entries using 1040 bytes of memory
5/2 BGP path/bestpath attribute entries using 620 bytes of memory
4 BGP AS-PATH entries using 96 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 2926 total bytes of memory
BGP activity 10/0 prefixes, 20/0 paths, scan interval 60 secs

Neighbor        V    AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down  State/PfxRcd
136.1.15.1      4   100      43      42       11    0    0 00:36:49       10
136.1.57.7      4   200       4       6       11    0    0 00:00:44        0
136.1.245.2     4   300      32      32       11    0    0 00:26:18       10
150.1.4.4       4   400      39      42       11    0    0 00:36:15        0
192.10.1.254    4   254      39      42       11    0    0 00:35:06        0
R5#

 

 

 

Comments

  • Creating a sub-interface on Router 5 nor enabling dot1q is required to make this work. Make sure you have the IP address 136.1.57.5 assigned to fa0/1 on Router 5 and that its direct connection to Switch 3 port 0/5 has been added to vlan 57.

    Make sure that you have trunking configured between Switch 3 and Switch 1 and that it is carrying Vlan 57. You should then be able to ping the Vlan 57 IP address of Switch 1 from Router 5.

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