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Bronze

virtual link (ospf) and md5

Hi everybody

How is everyone?

A virtual is established between R1 and R3

R1 and R3 both are connected via virtual link.

R1 is configured to use Md5 on virtual link  while R3  is not.

I am surprised to find the link stay up even when i reset the ospf process on r3.

Is it the normal behavior ?

Below is the config:

R3 config:

router ospf 1

router-id 3.3.3.3

log-adjacency-changes

area 1 virtual-link 1.1.1.1

network 198.198.198.0 0.0.0.255 area 0

network 199.199.199.0 0.0.0.255 area 1

!

R1 config:

router ospf 1

router-id 1.1.1.1

log-adjacency-changes

area 1 virtual-link 3.3.3.3 authentication message-digest

area 1 virtual-link 3.3.3.3 message-digest-key 1 md5 zee

network 10.0.0.0 0.255.255.255 area 0

network 200.200.200.0 0.0.0.255 area 1

========================================================

R3#clear ip ospf process

Reset ALL OSPF processes? [no]: y

R3#

*Mar  1 01:26:15.147: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Serial0/0 from FULL to DOWN, Neighbor Down: Interface down or detached

R3#

*Mar  1 01:26:16.155: %OSPF-5-ADJCHG: Process 1, Nbr 2.2.2.2 on Serial0/0 from LOADING to FULL, Loading Done

R3#show ip ospf virtual-link

Virtual Link OSPF_VL1 to router 1.1.1.1 is up

  Run as demand circuit

  DoNotAge LSA allowed.

  Transit area 1, via interface Serial0/0, Cost of using 128

  Transmit Delay is 1 sec, State POINT_TO_POINT,

  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

    Hello due in 00:00:08

Thanks and have a nice weekend

1 ACCEPTED SOLUTION

Accepted Solutions

virtual link (ospf) and md5

Hi Sarah,

I belive you are using GNS3. Which image are you using. I labbed it on a 7200 and can see the virtual link bounce.

r11#sh ip ospf virtual-links

Virtual Link OSPF_VL1 to router 10.1.1.1 is up

  Run as demand circuit

  DoNotAge LSA allowed.

  Transit area 1, via interface GigabitEthernet1/0, Cost of using 1

  Transmit Delay is 1 sec, State POINT_TO_POINT,

  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

    Hello due in 00:00:03

r11#clear ip ospf process   

Reset ALL OSPF processes? [no]: yes

r11#sh ip ospf virtual-links

*Nov 26 20:42:57.655: %OSPF-5-ADJCHG: Process 1, Nbr 10.1.1.1 on GigabitEthernet1/0 from FULL to DOWN, Neighbor Down: Interface down or detached

*Nov 26 20:42:57.791: %OSPF-5-ADJCHG: Process 1, Nbr 10.1.1.1 on GigabitEthernet1/0 from LOADING to FULL, Loading Done

Virtual Link OSPF_VL1 to router 10.1.1.1 is down

  Run as demand circuit

  DoNotAge LSA allowed.

  Transit area 1, Cost of using 65535

  Transmit Delay is 1 sec, State DOWN,

  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

r11#

HTH

Kishore

2 REPLIES

virtual link (ospf) and md5

Hi Sarah,

I belive you are using GNS3. Which image are you using. I labbed it on a 7200 and can see the virtual link bounce.

r11#sh ip ospf virtual-links

Virtual Link OSPF_VL1 to router 10.1.1.1 is up

  Run as demand circuit

  DoNotAge LSA allowed.

  Transit area 1, via interface GigabitEthernet1/0, Cost of using 1

  Transmit Delay is 1 sec, State POINT_TO_POINT,

  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

    Hello due in 00:00:03

r11#clear ip ospf process   

Reset ALL OSPF processes? [no]: yes

r11#sh ip ospf virtual-links

*Nov 26 20:42:57.655: %OSPF-5-ADJCHG: Process 1, Nbr 10.1.1.1 on GigabitEthernet1/0 from FULL to DOWN, Neighbor Down: Interface down or detached

*Nov 26 20:42:57.791: %OSPF-5-ADJCHG: Process 1, Nbr 10.1.1.1 on GigabitEthernet1/0 from LOADING to FULL, Loading Done

Virtual Link OSPF_VL1 to router 10.1.1.1 is down

  Run as demand circuit

  DoNotAge LSA allowed.

  Transit area 1, Cost of using 65535

  Transmit Delay is 1 sec, State DOWN,

  Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

r11#

HTH

Kishore

Bronze

virtual link (ospf) and md5

Thanks Kishore

Cisco IOS Software, 2600 Software (C2691-ADVIPSERVICESK9-M), Version 12.4(15)T6, RELEASE SOFTWARE (fc2)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2008 by Cisco Systems, Inc.

Compiled Mon 07-Jul-08 04:30 by prod_rel_team

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