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  1. Resident Underachiever EdTheLad's Avatar
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    #1

    Default autoroute metric absolute

    I thought the idea behind the subcommand "absolute" was that all prefixes behind the tunnel would be given this metric?

    Code:
    interface Tunnel1
     ip unnumbered Loopback0
     tunnel destination 4.4.4.4
     tunnel mode mpls traffic-eng
     tunnel mpls traffic-eng autoroute announce
     tunnel mpls traffic-eng autoroute metric absolute 10
     tunnel mpls traffic-eng path-option 5 explicit name TEST
     no routing dynamic
    
    R2#sh ip route 4.4.4.4
    Routing entry for 4.4.4.4/32
      Known via "ospf 1", distance 110, metric 11, type intra area
      Last update from 4.4.4.4 on Tunnel1, 00:14:56 ago
      Routing Descriptor Blocks:
      * 4.4.4.4, from 4.4.4.4, 00:14:56 ago, via Tunnel1
          Route metric is 11, traffic share count is 1
    
    R2#sh ip route 8.8.8.8
    Routing entry for 8.8.8.8/32
      Known via "ospf 1", distance 110, metric 21, type intra area
      Last update from 4.4.4.4 on Tunnel1, 00:15:02 ago
      Routing Descriptor Blocks:
      * 4.4.4.4, from 8.8.8.8, 00:15:02 ago, via Tunnel1
          Route metric is 21, traffic share count is 1
    I was expecting both prefixes to have a cost of 10.
    If i remove the absolute and just have metric i get the same result.

    Code:
    interface Tunnel1
     ip unnumbered Loopback0
     tunnel destination 4.4.4.4
     tunnel mode mpls traffic-eng
     tunnel mpls traffic-eng autoroute announce
     tunnel mpls traffic-eng autoroute metric 10
     tunnel mpls traffic-eng path-option 5 explicit name TEST
     no routing dynamic
    
    R2#sh ip route 4.4.4.4
    Routing entry for 4.4.4.4/32
      Known via "ospf 1", distance 110, metric 11, type intra area
      Last update from 4.4.4.4 on Tunnel1, 00:01:23 ago
      Routing Descriptor Blocks:
      * 4.4.4.4, from 4.4.4.4, 00:01:23 ago, via Tunnel1
          Route metric is 11, traffic share count is 1
    
    R2#sh ip route 8.8.8.8
    Routing entry for 8.8.8.8/32
      Known via "ospf 1", distance 110, metric 21, type intra area
      Last update from 4.4.4.4 on Tunnel1, 00:01:25 ago
      Routing Descriptor Blocks:
      * 4.4.4.4, from 8.8.8.8, 00:01:25 ago, via Tunnel1
          Route metric is 21, traffic share count is 1
    So what exactly is the absolute subcommand doing for me?
    Networking, sometimes i love it, mostly i hate it.Its all about the $$$$
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  2. Senior Member
    Join Date
    Sep 2013
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    Sweden
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    CCNP
    #2
    I don't know if you're still wondering about this Ed, but I remembered this thread when I read some notes I had on the Cisco Press TE book. Your problem is probably that you're using OSPF:

    Only IS-IS supports tunnel mpls traffic-eng autoroute metric absolute; if you configure absolute metrics on an OSPF network, it's just ignored.
    https://books.google.se/books?id=hpE...nored.&f=false

    The book's fairly old (2002 I think) so it might have nothing to do with this at all...
    Last edited by fredrikjj; 08-27-2015 at 08:44 PM.
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