ISIS RIB Prefix Priority with Passive-Lo0 ??

Has someone configured ISIS Prefix Priority for Lo0 address ... where the Lo0 also needs to not have adjacency attempts i.e. Passive-intf. ?

 

For example see link... but I get this problem that after configuring "isis tag xxx" under Lo0 Interface, when I do "show run int lo0" the command is NOT there ??

http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/fslocrib.html

 

Someone knows some other methods ?? working with Lo0 as passive interface ??

 

Thanks

Comments

  • Hi Sarsovsk,

     

    I have tested it, I have R4 and R5 connected with each other and i have configured loopback0 on R5 configured with tag101 and I can see that tag assgined for that prefix on R4.

    R5#

    interface Loopback0
     ip address 150.1.1.5 255.255.255.255
     no ip directed-broadcast
     isis tag 101
    end

    router isis
     net 49.0000.0000.0000.0005.00
     is-type level-2-only
     metric-style wide
     ip route priority high tag 101
     passive-interface Loopback0
    !

    R5#sh ver
    Cisco Internetwork Operating System Software
    IOS (tm) 7200 Software (C7200-P-M), Version 12.0(31)S, RELEASE SOFTWARE (fc1)
    Technical Support: http://www.cisco.com/techsupport
    Copyright (c) 1986-2005 by cisco Systems, Inc.
    Compiled Sat 16-Apr-05 23:39 by kellythw
    Image text-base: 0x60008F3C, data-base: 0x6161A000

    ROM: ROMMON Emulation Microcode
    BOOTLDR: 7200 Software (C7200-P-M), Version 12.0(31)S, RELEASE SOFTWARE (fc1)

     

    For verification You can run "show isis rib" on connected neighbor.

    R4#show isis rib

    IPv4 local RIB for IS-IS process
    45.45.45.0/24
      [115/L2/20] via 45.45.45.5(FastEthernet0/0.45), from 150.1.1.5, tag 0, LSP[2/1
    5]
    56.56.56.0/24
      [115/L2/20] via 45.45.45.5(FastEthernet0/0.45), from 150.1.1.5, tag 0, LSP[2/1
    5]
    150.1.1.5/32
      [115/L2/10] via 45.45.45.5(FastEthernet0/0.45), from 150.1.1.5, tag 101, LSP[2
    /15]
    R4#

     

    thanks,

    Dev

     

  • <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">


    Re: [CCIE SP] ISIS RIB Prefix Priority with Passive-Lo0 ??




    I've done the same.... Now imagine every time you put:



    # int lo0

    -if)# isis tag 101 ! cli accepts the command...

    -if)# do sh run int lo0

    ....(isis tag 101) - is NOT shown...



    Tried multiple times... again and again doesn't show the command, neither showing the tag in 'show isis rib'...







    Cisco GmbH

    Stefan Arsovski

    [email protected];

    +49 173 38 10 994;



     -----Original Message-----

    From:   dev13 [mailto:[email protected]]

    Sent:   Wednesday, March 11, 2009 09:20 AM GMT Standard Time

    To:     Stefan Arsovski (sarsovsk)

    Subject:        Re: [CCIE SP] ISIS RIB Prefix Priority with Passive-Lo0 ??



    Hi Sarsovsk,







    I have tested it, I have R4 and R5 connected with each other and i have configured loopback0 on R5 configured with tag101 and I can see that tag assgined for that prefix on R4.



    R5#



    interface Loopback0

     ip address 150.1.1.5 255.255.255.255

     no ip directed-broadcast

     isis tag 101

    end



    router isis

     net 49.0000.0000.0000.0005.00

     is-type level-2-only

     metric-style wide

     ip route priority high tag 101

     passive-interface Loopback0

    !



    R5#sh ver

    Cisco Internetwork Operating System Software

    IOS (tm) 7200 Software (C7200-P-M), Version 12.0(31)S, RELEASE SOFTWARE (fc1)

    Technical Support: http://www.cisco.com/techsupport

    Copyright (c) 1986-2005 by cisco Systems, Inc.

    Compiled Sat 16-Apr-05 23:39 by kellythw

    Image text-base: 0x60008F3C, data-base: 0x6161A000



    ROM: ROMMON Emulation Microcode

    BOOTLDR: 7200 Software (C7200-P-M), Version 12.0(31)S, RELEASE SOFTWARE (fc1)







    For verification You can run "show isis rib" on connected neighbor.



    R4#show isis rib



    IPv4 local RIB for IS-IS process

    45.45.45.0/24

      [115/L2/20] via 45.45.45.5(FastEthernet0/0.45), from 150.1.1.5, tag 0, LSP[2/1

    5]

    56.56.56.0/24

      [115/L2/20] via 45.45.45.5(FastEthernet0/0.45), from 150.1.1.5, tag 0, LSP[2/1

    5]

    150.1.1.5/32

      [115/L2/10] via 45.45.45.5(FastEthernet0/0.45), from 150.1.1.5, tag 101, LSP[2

    /15]

    R4#







    thanks,



    Dev













    Internetwork Expert - The Industry Leader in CCIE Preparation

    http://www.internetworkexpert.com



    Subscription information may be found at:

    http://www.ieoc.com/forums/ForumSubscriptions.aspx





  • Here's the issue recreated on 2691.... look at the Lo0 config.... I configure the isis tag, but it simply doesn't show afterwards ??

     



    v:* {behavior:url(#default#VML);}
    o:* {behavior:url(#default#VML);}
    w:* {behavior:url(#default#VML);}
    .shape {behavior:url(#default#VML);}


    <!--
    /* Font Definitions */
    @font-face
    {font-family:"Cambria Math";
    panose-1:2 4 5 3 5 4 6 3 2 4;}
    @font-face
    {font-family:Calibri;
    panose-1:2 15 5 2 2 2 4 3 2 4;}
    @font-face
    {font-family:Tahoma;
    panose-1:2 11 6 4 3 5 4 4 2 4;}
    @font-face
    {font-family:"Century Gothic";
    panose-1:2 11 5 2 2 2 2 2 2 4;}
    @font-face
    {font-family:"Comic Sans MS";
    panose-1:3 15 7 2 3 3 2 2 2 4;}
    @font-face
    {font-family:Verdana;
    panose-1:2 11 6 4 3 5 4 4 2 4;}
    /* Style Definitions */
    p.MsoNormal, li.MsoNormal, div.MsoNormal
    {margin:0in;
    margin-bottom:.0001pt;
    font-size:12.0pt;
    font-family:"Times New Roman","serif";}
    a:link, span.MsoHyperlink
    {mso-style-priority:99;
    color:blue;
    text-decoration:underline;}
    a:visited, span.MsoHyperlinkFollowed
    {mso-style-priority:99;
    color:purple;
    text-decoration:underline;}
    p
    {mso-style-priority:99;
    mso-margin-top-alt:auto;
    margin-right:0in;
    mso-margin-bottom-alt:auto;
    margin-left:0in;
    font-size:12.0pt;
    font-family:"Times New Roman","serif";}
    span.EmailStyle19
    {mso-style-type:personal-reply;
    font-family:"Century Gothic","sans-serif";
    color:#548DD4;
    font-weight:bold;}
    p.pblblocklabel, li.pblblocklabel, div.pblblocklabel
    {mso-style-name:pbl_blocklabel;
    mso-margin-top-alt:auto;
    margin-right:0in;
    mso-margin-bottom-alt:auto;
    margin-left:0in;
    font-size:12.0pt;
    font-family:"Times New Roman","serif";}
    p.pb1body1, li.pb1body1, div.pb1body1
    {mso-style-name:pb1_body1;
    mso-margin-top-alt:auto;
    margin-right:0in;
    mso-margin-bottom-alt:auto;
    margin-left:0in;
    font-size:12.0pt;
    font-family:"Times New Roman","serif";}
    .MsoChpDefault
    {mso-style-type:export-only;
    font-size:10.0pt;}
    @page Section1
    {size:8.5in 11.0in;
    margin:1.0in 1.0in 1.0in 1.0in;}
    div.Section1
    {page:Section1;}
    -->

    R2(config-if)#do show run | beg isis
    router isis
     net
    49.1000.0000.0000.0002.00
     metric-style wide
     ip
    route priority high tag 101

    !
    <snip>

     

    R2(config-if)#int lo0
    R2(config-if)#
    do show run int lo0
    Building
    configuration...

     

    Current configuration : 64 bytes
    !
    interface
    Loopback0
     ip address 10.1.1.1
    255.255.255.255
    end

     

    R2(config-if)# isis tag
    101

    R2(config-if)# do show run int
    lo0

    Building configuration...

     

    Current configuration : 64 bytes
    !
    interface Loopback0
     ip address 10.1.1.1
    255.255.255.255
    end

     

    R2(config-if)#
    R2(config-if)#
    R2(config-if)#do show
    vers
    Cisco IOS Software, 2600 Software (C2691-SPSERVICESK9-M), Version
    12.4(15)T8, RE
    LEASE SOFTWARE (fc3)
    Technical Support: http://www.cisco.com/techsupport
    Copyright
    (c) 1986-2008 by Cisco Systems, Inc.
    Compiled Mon 01-Dec-08 14:49 by
    prod_rel_team

    <snip>

  • I cant see that you have enabled ISIS on the loopback or configed 'passive int lo0' under the ISIS process.

    you wont see any tag command until you enable ISIS on the interface.

     

  • Yeah, very true, you need to enable isis on loopback0 interface by "ip router isisi" under interface config mode or "passive inter loo0" under router isis configuration mode. As by assigning TAG and running priority of it fulfill the fast convergence requirement and priority based route installation in routing table for ISIS so you have to go for enabling isis on interface or advertising the same interface using passive interface feature.

     

    thanks

    Dev

  • It's about TLV 135 with it's Sub-TLV 1 (Admin. Tag, RFC5130) instead of TLVs 128 & 130 (they don't have any fields to carry the tag) ... metric-style wide

    http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/isfscpc.pdf


    Last Updated: February 3, 2009

     


     


     

     


     

     


    • 


     

    In order to use the route tag, you must configure the metric-style wide command. (The metric-style narrow  command is configured by default). The tag value is set into sub-TLV 1 for TLV (Type Length Value) Type 135.

     

     

    R1(config)# do show run int f0/0
    !
    interface FastEthernet0/0
     ip address 10.1.12.1 255.255.255.0
     ip router isis Lev20
     duplex auto
     speed auto
     isis tag 100
    end

    R1(config-router)# do show isis dat verb

    IS-IS Level-2 Link State Database:
    LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime      ATT/P/OL
    R1.00-00            * 0x0000000E   0x14CC        1063              0/0/0
      Area Address: 49.2000
      NLPID:        0xCC
      Hostname: R1
      IP Address:   10.1.1.1
      Metric: 10         IS R1.01
      Metric: 0          IP 10.1.1.1 255.255.255.255
      Metric: 10         IP 10.1.12.0 255.255.255.0
    R1.01-00            * 0x00000007   0x1040        1064              0/0/0
      Metric: 0          IS R1.00
      Metric: 0          IS R2.00

    R1(config-router)#
    R1(config-router)#
    R1(config-router)#  metric-style wide
    R1(config-router)#
    R1(config-router)# do show isis dat verb

    IS-IS Level-2 Link State Database:
    LSPID                 LSP Seq Num  LSP Checksum  LSP Holdtime      ATT/P/OL
    R1.00-00            * 0x0000000F   0xFD64        1198              0/0/0
      Area Address: 49.2000
      NLPID:        0xCC
      Hostname: R1
      IP Address:   10.1.1.1
      Metric: 10         IS-Extended R1.01
      Metric: 0          IP 10.1.1.1/32
      Metric: 10         IP 10.1.12.0/24
        Route Admin Tag: 100

    R1.01-00            * 0x00000008   0x8DB1        1199              0/0/0
      Metric: 0          IS-Extended R1.00
      Metric: 0          IS-Extended R2.00
    R2.00-00              0x00000006   0x7F63        788               0/0/0
      Area Address: 49.2100
      Area Address: 49.2000
      NLPID:        0xCC
      Hostname: R2
      IP Address:   10.1.12.2
      Metric: 10         IS R1.01
      Metric: 10         IP 10.1.12.0 255.255.255.0
    R1(config-router)#

     

Sign In or Register to comment.