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Route Metric help please

Discussion in 'Networks' started by Crazydave1990, May 19, 2013.

  1. Crazydave1990

    Crazydave1990 Bit Poster

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    Hi Guyz!

    So, I've made a couple of OSPF routes across three routers (R1, R2 and R3)

    The links appear as follows

    R3----->R1<------R2

    R1 is the central connecting point between R3 and R2.

    R1 has two subnets attached - 192.168.10.0 and 192.168.20.0
    R2 has one subnet attached - 192.168.30.0
    R3 has one subnet attached - 192.168.40.0

    For this example, all subnets are /24

    Now, I've got all the routers linked up, they've become neighbors successfully - and everything is working, however, one thing is slightly perplexing me, and that is that R1 has a metric of [110/782] for the 192.168.30.0 network

    Router1#show ip route
    Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
    D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
    N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
    E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
    i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
    * - candidate default, U - per-user static route, o - ODR
    P - periodic downloaded static route

    Gateway of last resort is not set

    172.16.0.0/24 is subnetted, 2 subnets
    C 172.16.1.0 is directly connected, Serial0/0
    C 172.16.3.0 is directly connected, Serial0/1
    C 192.168.1.0/24 is directly connected, FastEthernet0/0
    C 192.168.10.0/24 is directly connected, FastEthernet0/0.10
    C 192.168.20.0/24 is directly connected, FastEthernet0/0.20
    O 192.168.30.0/24 [110/782] via 172.16.1.2, 01:23:32, Serial0/0
    O 192.168.40.0/24 [110/65] via 172.16.3.1, 00:21:32, Serial0/1

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

    Router2#show ip route
    Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
    D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
    N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
    E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
    i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
    * - candidate default, U - per-user static route, o - ODR
    P - periodic downloaded static route

    Gateway of last resort is not set

    172.16.0.0/24 is subnetted, 2 subnets
    C 172.16.1.0 is directly connected, Serial0/0
    O 172.16.3.0 [110/128] via 172.16.1.1, 00:34:45, Serial0/0
    O 192.168.1.0/24 [110/65] via 172.16.1.1, 01:27:04, Serial0/0
    O 192.168.10.0/24 [110/65] via 172.16.1.1, 01:27:04, Serial0/0
    O 192.168.20.0/24 [110/65] via 172.16.1.1, 01:27:04, Serial0/0
    C 192.168.30.0/24 is directly connected, FastEthernet0/0
    O 192.168.40.0/24 [110/129] via 172.16.1.1, 00:24:55, Serial0/0


    I'm just struggling to understand this really... the network is working still, just wondered if anyone could help me understand this please?
     
  2. danielno8

    danielno8 Gigabyte Poster

    1,305
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    92
    What were are you expecting it to be? Interface cost is calculated by (under default configuration):

    100 (Mbps)/interface bandwidth (Mbps) = cost
     
    Last edited: May 20, 2013
    Certifications: CCENT, CCNA
    WIP: CCNP

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