RE: OSPF Type 5 path selection?

From: Daniel Cisco Group Study (danielcgs@imc.net.au)
Date: Tue May 13 2003 - 05:42:11 GMT-3


I need to read this myself, but I think that your answers are in the following doco:

http://www.cisco.com/warp/public/104/10.html

Daniel

-----Original Message-----
From: Richard Davidson [mailto:rich@myhomemail.net]
Sent: Monday, 12 May 2003 11:35
To: groupstudy
Subject: OSPF Type 5 path selection?

Can anyone explain to me why 172.16.104.1 was chosen
over 172.16.103.1? 172.16.134.4 is the next hop
address of 172.16.104.1?
Thanks
Richard

O E2 172.16.64.0/24 [110/200] via 172.16.134.4,
00:25:40, Serial0/0.134

R1#show ip ospf da external 172.16.64.0

            OSPF Router with ID (172.16.101.1)
(Process ID 1)

                Type-5 AS External Link States

  LS age: 1330
  Options: (No TOS-capability, DC)
  LS Type: AS External Link
  Link State ID: 172.16.64.0 (External Network Number
)
  Advertising Router: 172.16.103.1
  LS Seq Number: 80000002
  Checksum: 0x8773
  Length: 36
  Network Mask: /24
        Metric Type: 2 (Larger than any link state
path)
        TOS: 0
        Metric: 200
        Forward Address: 172.16.255.6
        External Route Tag: 11

  Routing Bit Set on this LSA
  LS age: 1108
  Options: (No TOS-capability, DC)
  LS Type: AS External Link
  Link State ID: 172.16.64.0 (External Network Number
)
  Advertising Router: 172.16.104.1
  LS Seq Number: 80000005
  Checksum: 0xF9BF
  Length: 36
  Network Mask: /24
        Metric Type: 2 (Larger than any link state
path)
        TOS: 0
        Metric: 200
        Forward Address: 0.0.0.0 {what does this mean?
        External Route Tag: 11

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