Wednesday, August 19, 2015

OSPF - Path Selection




OSPF Path Selection

Based on Cost







R2#sh ip route 6.6.6.6
Routing entry for 6.6.6.6/32
  Known via "ospf 10", distance 110, metric 31, type inter area
  Last update from 23.0.0.3 on FastEthernet0/1, 00:00:33 ago
  Routing Descriptor Blocks:
  * 23.0.0.3, from 1.1.1.1, 00:00:34 ago, via FastEthernet0/1

      Route metric is 31, traffic share count is 1

R2#sh ip ospf database summary 6.6.6.6

            OSPF Router with ID (2.2.2.2) (Process ID 10)

                Summary Net Link States (Area 0)

  Routing Bit Set on this LSA in topology Base with MTID 0
  LS age: 1391
  Options: (No TOS-capability, DC, Upward)
  LS Type: Summary Links(Network)
  Link State ID: 6.6.6.6 (summary Network Number)
  Advertising Router: 1.1.1.1
  LS Seq Number: 80000008
  Checksum: 0xB658
  Length: 28
  Network Mask: /32
        MTID: 0         Metric: 11

  LS age: 444
  Options: (No TOS-capability, DC, Upward)
  LS Type: Summary Links(Network)
  Link State ID: 6.6.6.6 (summary Network Number)
  Advertising Router: 55.5.5.5
  LS Seq Number: 80000008
  Checksum: 0x7A52
  Length: 28
  Network Mask: /32
        MTID: 0         Metric: 11


                Summary Net Link States (Area 2)

  LS age: 149
  Options: (No TOS-capability, DC, Upward)
  LS Type: Summary Links(Network)
  Link State ID: 6.6.6.6 (summary Network Number)
  Advertising Router: 2.2.2.2
  LS Seq Number: 8000000C
  Checksum: 0x5999
  Length: 28
  Network Mask: /32
        MTID: 0         Metric: 31

  LS age: 428
  Options: (No TOS-capability, DC, Upward)
  LS Type: Summary Links(Network)
  Link State ID: 6.6.6.6 (summary Network Number)
  Advertising Router: 44.4.4.4
  LS Seq Number: 80000001
  Checksum: 0x6F67
  Length: 28
  Network Mask: /32
        MTID: 0         Metric: 22

R2#
R2#




R2#sh ip route 6.6.6.6

Routing entry for 6.6.6.6/32
  Known via "ospf 10", distance 110, metric 31, type inter area
  Last update from 23.0.0.3 on FastEthernet0/1, 00:09:54 ago
  Routing Descriptor Blocks:
  * 23.0.0.3, from 1.1.1.1, 00:09:54 ago, via FastEthernet0/1
      Route metric is 31, traffic share count is 1
R2#

Gateway of last resort is not set

      6.0.0.0/32 is subnetted, 1 subnets
O IA     6.6.6.6 [110/31] via 23.0.0.3, 00:15:44, FastEthernet0/1
      9.0.0.0/32 is subnetted, 1 subnets
O        9.9.9.9 [110/10001] via 172.16.0.9, 01:03:10, Tunnel0
      13.0.0.0/24 is subnetted, 1 subnets
O        13.0.0.0 [110/20] via 23.0.0.3, 01:02:42, FastEthernet0/1
      15.0.0.0/24 is subnetted, 1 subnets
O        15.0.0.0 [110/30] via 23.0.0.3, 00:15:44, FastEthernet0/1
      16.0.0.0/24 is subnetted, 1 subnets
O IA     16.0.0.0 [110/30] via 23.0.0.3, 00:47:12, FastEthernet0/1
      34.0.0.0/24 is subnetted, 1 subnets
O        34.0.0.0 [110/11] via 23.0.0.3, 01:03:10, FastEthernet0/1
      56.0.0.0/24 is subnetted, 1 subnets
O IA     56.0.0.0 [110/35] via 25.0.0.5, 00:14:50, FastEthernet0/0
      172.16.0.0/16 is variably subnetted, 4 subnets, 2 masks
O        172.16.0.4/32 [110/10000] via 172.16.0.4, 01:03:10, Tunnel0
O        172.16.0.9/32 [110/10000] via 172.16.0.9, 01:03:10, Tunnel0
O     201.2.0.0/24 [110/26] via 25.0.0.5, 00:14:50, FastEthernet0/0


OSPF Path Selection with Per-Neighbor Cost





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