12-30-2003 12:12 PM - edited 03-02-2019 12:37 PM
Hi everybody.
I have two Cisco 7200VXR routers connected via ATM-E3 link (PA-A3-E3 cards). Sometimes (approximately once per week) after link down/up flow (CRC level on ATM interface in this short time increase) I have a serious problems with OSPF.
Routers has established neighbor adjancencies:
bazilio>sh ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface
193.254.221.3 1 FULL/BDR 00:00:39 193.125.78.165 FastEthernet0/0.9
193.254.221.4 0 FULL/ - 00:00:35 193.125.78.82 ATM1/0.2
bazilio>
Routers has networks in link state fatabase:
bazilio>sh ip ospf database | inc 193.125.78.208
...
193.125.78.208 193.254.221.4 665 0x80000322 0x0013770
but has no same networks in routing table:
bazilio>sh ip route 193.125.78.208
% Network not in table
In this state OSPF may stay hours. The workaround is "clear ip ospf process" command. This takes place on all IOSes (including 123-3a).
Does anybody know how can I solve this problem ? Does migration from OSPF to EIGRP or IS-IS solve it ?
12-31-2003 12:26 AM
Hello,
can you post the configs of both routers ?
You might want to check out this document:
Why Are Some OSPF Routes in the Database but Not in the Routing Table?
http://www.cisco.com/en/US/partner/tech/tk365/tk480/technologies_tech_note09186a008009481a.shtml
Regards,
GP
12-31-2003 01:30 AM
Please post
sh ip o d net 193.125.78.208
12-31-2003 08:32 AM
is your next hop from the sh ip ospf database pingable ?
01-03-2004 04:07 AM
Nexthop (193.125.78.82) is pingable, telnetable and moreover according to "sh ip ospf neig" OSPF hello messages sends and receives each 40 seconds.
01-02-2004 04:03 AM
Ok.
bazilio>sh ip o d net 193.125.78.208
OSPF Router with ID (193.125.78.245) (Process ID 1)
bazilio>
01-02-2004 05:24 AM
It's probably not a net--is it an external? Try
show ip ospf data detail extern 193.125.78.208
:-)
Russ
01-02-2004 05:34 AM
Please also try it without the detail keyword:
show ip ospf data extern 193.125.78.208
01-03-2004 04:39 AM
I will post result of this command when ospf troubles later (I need wait this event), but now when ospf works correct I have:
bazilio#sh ip ospf database external x.x.x.208
OSPF Router with ID (x.x.x.245) (Process ID 1)
Type-5 AS External Link States
Routing Bit Set on this LSA
LS age: 1597
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: x.x.x.208 (External Network Number )
Advertising Router: 193.254.221.4
LS Seq Number: 8000015C
Checksum: 0xA4AD
Length: 36
Network Mask: /28
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 0.0.0.0
External Route Tag: 0
bazilio#sh ip ospf database ext 0.0.0.0
OSPF Router with ID (x.x.x.245) (Process ID 1)
Type-5 AS External Link States
Routing Bit Set on this LSA
LS age: 1647
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 0.0.0.0 (External Network Number )
Advertising Router: 193.254.221.4
LS Seq Number: 800010D4
Checksum: 0x72B9
Length: 36
Network Mask: /0
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 1
Forward Address: 0.0.0.0
External Route Tag: 1
bazilio#
I put configuration of both routers to
http://www.univ.kiev.ua/~roman/ospf/
You can access to routers via test account. Ssh to 193.125.78.250, use 'test' as login, 'ospf_test' as password, next telnet to router (tom or bazilio). Use the same login and password.
01-04-2004 08:58 AM
The router thinks these routes are valid, and installed in the local routing table--"Routing Bit Set on this LSA." Are they always out of the routing table, or just sometimes, or (?)....
:-)
Russ.W
01-05-2004 01:25 AM
It is not permanet situation. This happens sometimes, after series of E3 link down-up flaping.
01-05-2004 05:13 AM
How often does it happen? We'd need this output, plus show ip route for those routes, when it's actually happening, to figure out why OSPF won't install them.
:-)
Russ.W
01-13-2004 03:11 AM
When 193.125.78.208/28 is not in routing table, the
"show ip ospf database ext 193.125.78.208" command
produce:
OSPF Router with ID (193.125.78.245) (Process ID 1)
Type-5 AS External Link States
Routing Bit Set on this LSA
LS age: 1074
Options: (No TOS-capability, DC)
LS Type: AS External Link
Link State ID: 193.125.78.208 (External Network Number )
Advertising Router: 193.254.221.4
LS Seq Number: 80000293
Checksum: 0x33E6
Length: 36
Network Mask: /28
Metric Type: 2 (Larger than any link state path)
TOS: 0
Metric: 20
Forward Address: 0.0.0.0
External Route Tag: 0
01-14-2004 05:13 AM
AFAIK if it says routing bit set on lsa, then it should appear in the main routing table, so it looks like you have a bug, and should start by upgrading your code. What IOS are you running now?
01-14-2004 06:47 AM
But instead installed in routing table route I have:
bazilio>show ip route 193.125.78.208
% Subnet not in table
My IOS version is c7200-js-mz.123-3.bin
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