Instability on Rollover in Virtual Area

From: gladston@br.ibm.com
Date: Tue Aug 23 2005 - 12:41:22 GMT-3


It seems to work fine on the first view, but monitoring "deb ip os adj" shows that the adjacency on virtual link goes UP and Down frequently.

If key 4 is removed, the adjacency is stable.

R7#b router os
router ospf 1
 area 37 virtual-link 3.3.3.3 authentication message-digest
 area 37 virtual-link 3.3.3.3 message-digest-key 3 md5 teste3
 area 37 virtual-link 3.3.3.3 message-digest-key 4 md5 teste4
 network 148.5.37.0 0.0.0.255 area 37
 network 148.5.150.0 0.0.0.255 area 777

router ospf 1
 router-id 3.3.3.3
 area 37 virtual-link 148.5.77.7 authentication message-digest
 area 37 virtual-link 148.5.77.7 message-digest-key 3 md5 teste3
 network 148.5.37.0 0.0.0.255 area 37
 network 148.5.235.0 0.0.0.255 area 0

Any comments appreciated.

Monitoring
With key 4:

Rack2R3#so 148.5.77.7 det
 Neighbor 148.5.77.7, interface address 148.5.37.7
    In the area 0 via interface OSPF_VL0
    Neighbor priority is 0, State is FULL, 6 state changes
    DR is 0.0.0.0 BDR is 0.0.0.0
    Options is 0x62
    Dead timer due in 00:00:05
    Neighbor is up for 00:00:42 <-------------------------
    Index 1/1, retransmission queue length 0, number of retransmission 1
    First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
    Last retransmission scan length is 1, maximum is 1
    Last retransmission scan time is 0 msec, maximum is 0 msec
 Neighbor 148.5.77.7, interface address 148.5.37.7
    In the area 37 via interface Serial1/1.37
    Neighbor priority is 0, State is FULL, 18 state changes
    DR is 0.0.0.0 BDR is 0.0.0.0
    Options is 0x42
    Dead timer due in 00:00:33
    Neighbor is up for 01:16:35
    Index 1/3, retransmission queue length 0, number of retransmission 64
    First 0x0(0)/0x0(0) Next 0x0(0)/0x0(0)
    Last retransmission scan length is 1, maximum is 17
    Last retransmission scan time is 0 msec, maximum is 0 msec



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