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system id's suffixes on protocol isis

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  • 1.  system id's suffixes on protocol isis

    Posted 07-03-2017 19:58

    Hi all, 

    I'm so confused about suffixes system id on protocol isis. 
    When I show "show isis database"
    user@host> show isis database

    IS-IS level 1 link-state database:
    LSP ID                      Sequence Checksum Lifetime Attributes
    kobuk.00-00                      0x3   0x3167     1057 L1 L2
    camaro.00-00                     0x5   0x770e     1091 L1 L2
    ranier.00-00                     0x4   0xaa95     1091 L1 L2
    glacier.00-00                    0x4   0x206f     1089 L1 L2
    glacier.02-00                    0x1   0xd141     1089 L1 L2
    badlands.00-00                   0x3   0x87a2     1093 L1 L2
      6 LSPs

    What is different between glacier.00-00 and glacier.02-00 and what functions of 2 system-id?
    Sometimes, I see that suffixes on protocol ISIS can be 03-00. 


    Thanks a lot.



  • 2.  RE: system id's suffixes on protocol isis

    Posted 07-03-2017 22:39

    glacier.02-00 - designated intermediate system (DIS)



  • 3.  RE: system id's suffixes on protocol isis
    Best Answer

    Posted 07-04-2017 01:50

    Hi,

     

    For each LAN segment there should be a DIS.  Except 00-00 all LSPs in the "show isis database"  whether 02-00, 03-00 or 04-00 are generated by Designated Intermediate System (DIS).

     

     

     

    Regards,

    Rahul

     

    Please mark my solution as accepted if it helped.

     

     

     

     

     



  • 4.  RE: system id's suffixes on protocol isis

    Posted 07-04-2017 11:29

    The pseudo-node (handled by the DIS) also advertises it's LSP.

     

    glacier.00-00 = glacier LSP

    glacier.02-00 = pseudo-node LSP



  • 5.  RE: system id's suffixes on protocol isis

    Posted 07-05-2017 01:32

    Thank all, 

    I understood. 

    🙂