[c-nsp] OSPFv3 down every 34 minutes

[Eric Van Tol]

Hi all,
Wondering if anyone has seen this yet.  I recently upgraded a pair of 6509s to 12.2(18)SXF13 and since then, one of them seems to lose OSPFv3 adjacencies every 34 minutes on the dot.  The adjacencies to the three other routers on this *one* particular SVI drop due to "too many retransmissions".  Debug shows nothing particularly useful besides "too many retransmits".  I've checked configs on both the 6509s and the adjacent routers and all looks up-to-snuff.  The other routers never lose adjacencies with the second 6509 and are all coming in across different physical interfaces.  MTUs are correct, no interface errors or drops, no mis-matched timers, etc.  Other neighbors have been up for over a week, since I last did a 'clear ipv6 ospf process' after updating OSPFv3 priorities.

The outputs below show the 'ipv6 ospf neighbor detail' from the three affected neighbors.

The only thing I can think of is that there is a process kicking off every 34 minutes on this one 6509, but I can't figure out what it could be.  I was previously on 12.2(18)SXF3 and this wasn't happening.  I checked Bug Navigator and couldn't find anything concrete or even similar in SXF13.

Any ideas where to look?

Thanks,
evt

~~~~~~~~~~~~~~~~~~~~~

interface Vlan2
 ip address x.x.x.x 255.255.255.224
 no ip redirects
 no ip unreachables
 ip ospf authentication-key xxxxxxx
 ip ospf priority 90
 ipv6 address x:x:x:x::/64
 ipv6 enable
 ipv6 ospf priority 5
 ipv6 ospf 600 area 75
 standby 1 ip x.x.x.x
 standby 1 priority 90
 standby 1 preempt
 standby 1 authentication xxxxxx
!
Vlan2 is up, line protocol is up
  Hardware is EtherSVI, address is 00d0.02b6.3400 (bia 00d0.02b6.3400)
  Internet address is x.x.x.x/27
  MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
     reliability 255/255, txload 17/255, rxload 10/255
  Encapsulation ARPA, loopback not set
  Keepalive not supported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/16/16 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 42406000 bits/sec, 11880 packets/sec
  5 minute output rate 68446000 bits/sec, 11553 packets/sec
  L2 Switched: ucast: 1923473851 pkt, 1081449259861 bytes - mcast: 1839775 pkt, 193492810 bytes
  L3 in Switched: ucast: 6107349982 pkt, 3277271069494 bytes - mcast: 0 pkt, 0 bytes mcast
  L3 out Switched: ucast: 6976977824 pkt, 3721569539249 bytes mcast: 0 pkt, 0 bytes
     6110601771 packets input, 3277564197885 bytes, 0 no buffer
     Received 1829472 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     6980413289 packets output, 3722016274612 bytes, 0 underruns
     0 output errors, 0 interface resets
     0 output buffer failures, 0 output buffers swapped out
!
sh ipv6 interface vlan 2
Vlan2 is up, line protocol is up
  IPv6 is enabled, link-local address is FE80::2D0:2FF:FEB6:3400
  Global unicast address(es):
    x:x:x:x:x:x:x:x, subnet is x:x:x:x::/64
  Joined group address(es):
    FF02::1
    FF02::2
    FF02::5
    FF02::6
    FF02::1:FFB6:3400
    FF02::1:FFBC:D102
  MTU is 1500 bytes
  ICMP error messages limited to one every 100 milliseconds
  ICMP redirects are enabled
  ND DAD is enabled, number of DAD attempts: 1
  ND reachable time is 30000 milliseconds
  ND advertised reachable time is 0 milliseconds
  ND advertised retransmit interval is 0 milliseconds
  ND router advertisements are sent every 200 seconds
  ND router advertisements live for 1800 seconds
  Hosts use stateless autoconfig for addresses.
!
Neighbor x.x.x.x
    In the area 75 via interface Vlan2
    Neighbor: interface-id 2, link-local address FE80::21B:C0FF:FE56:C502
    Neighbor priority is 3, State is FULL, 6 state changes
    DR is x.x.x.9 BDR is x.x.x.8
    Options is 0x56730A1D
    Dead timer due in 00:00:37
    Neighbor is up for 00:10:10
    Index 2/4/4, retransmission queue length 0, number of retransmission 0
    First 0x0(0)/0x0(0)/0x0(0) Next 0x0(0)/0x0(0)/0x0(0)
    Last retransmission scan length is 0, maximum is 0
    Last retransmission scan time is 0 msec, maximum is 0 msec
 Neighbor x.x.x.9
    In the area 75 via interface Vlan2
    Neighbor: interface-id 111, link-local address FE80::2D0:4FF:FE48:1400
    Neighbor priority is 10, State is FULL, 6 state changes
    DR is x.x.x.9 BDR is x.x.x.8
    Options is 0x51A5AF75
    Dead timer due in 00:00:30
    Neighbor is up for 00:10:11
    Index 1/3/3, retransmission queue length 0, number of retransmission 0
    First 0x0(0)/0x0(0)/0x0(0) Next 0x0(0)/0x0(0)/0x0(0)
    Last retransmission scan length is 0, maximum is 0
    Last retransmission scan time is 0 msec, maximum is 0 msec
 Neighbor x.x.x.11
    In the area 75 via interface Vlan2
    Neighbor: interface-id 3, link-local address FE80::2D0:63FF:FE2F:7800
    Neighbor priority is 1, State is FULL, 6 state changes
    DR is x.x.x.9 BDR is x.x.x.8
    Options is 0x4AB7B4CD
    Dead timer due in 00:00:31
    Neighbor is up for 00:10:18
    Index 3/5/5, retransmission queue length 0, number of retransmission 0
    First 0x0(0)/0x0(0)/0x0(0) Next 0x0(0)/0x0(0)/0x0(0)
    Last retransmission scan length is 0, maximum is 0
    Last retransmission scan time is 0 msec, maximum is 0 msec