OSPF bug on 7200

r-sinyuk · ‎12-30-2003

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 ?

Georg Pauwen · ‎12-31-2003

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

ipotts · ‎12-31-2003

Please post

sh ip o d net 193.125.78.208

deilert · ‎12-31-2003

is your next hop from the sh ip ospf database pingable ?

r-sinyuk · ‎01-03-2004

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.

r-sinyuk · ‎01-02-2004

Ok.

bazilio>sh ip o d net 193.125.78.208

OSPF Router with ID (193.125.78.245) (Process ID 1)

bazilio>

ruwhite · ‎01-02-2004

It's probably not a net--is it an external? Try

show ip ospf data detail extern 193.125.78.208

:-)

Russ

ipotts · ‎01-02-2004

Please also try it without the detail keyword:

show ip ospf data extern 193.125.78.208

r-sinyuk · ‎01-03-2004

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.

ruwhite · ‎01-04-2004

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

r-sinyuk · ‎01-05-2004

It is not permanet situation. This happens sometimes, after series of E3 link down-up flaping.

ruwhite · ‎01-05-2004

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

r-sinyuk · ‎01-13-2004

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

ipotts · ‎01-14-2004

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?

r-sinyuk · ‎01-14-2004

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