[nsp] sudden OSPF failures

[jlewis at lewis.org]

On Wed, 24 Sep 2003 Jack.W.Parks at alltel.com wrote:

> Are all your 5300 interfaces in OSPF like:
> 
> Router ospf 1
>   network 192.168.0.0 0.0.255.255 area x
> 
> Or are you redistributing connected?  We have run into a feature
> limitation with Cisco's implementation of OSPF having a finite amount of
> ospf interfaces per box.

Only interfaces that speak OSPF to other devices are covered by OSPF 
network statements.  We redistribute static and connected on all 
routers/access-servers, using summary-address statements on 
access-servers to summarize their dial-pools.  On access-servers, 
virtual-template and group-async interfaces are set to passive-interface.

> 00:39:14: %SYS-2-GETBUF: Bad getbuffer, bytes= 18028
> -Process= "OSPF Router", ipl= 0, pid= 148 

I wasn't seeing any such error messages during the route flapping.

> The workaround would be to increase the huger buffer size to allocate
> more resources. 

If buffers were the problem, I suppose I should see failures in "show 
buff"?  I don't see any on the 2501 in the problem POP...but I do see them 
on the 5248's.

5248-2:
Big buffers, 1524 bytes (total 170, permanent 50):
     112 in free list (5 min, 150 max allowed)
     5680805 hits, 3858 misses, 5162 trims, 5282 created
     715 failures (0 no memory)
VeryBig buffers, 4520 bytes (total 10, permanent 10):
     10 in free list (0 min, 100 max allowed)
     29784 hits, 28 misses, 8 trims, 8 created
     28 failures (0 no memory)
Large buffers, 5024 bytes (total 0, permanent 0):
     0 in free list (0 min, 10 max allowed)
     13 hits, 15 misses, 5 trims, 5 created
     15 failures (0 no memory)
Huge buffers, 18024 bytes (total 0, permanent 0):
     0 in free list (0 min, 4 max allowed)
     4 hits, 11 misses, 5 trims, 5 created
     11 failures (0 no memory)

5248-4 (this one gave me some trouble yesterday after -2 stabilized):
Big buffers, 1524 bytes (total 112, permanent 50):
     64 in free list (5 min, 150 max allowed)
     3842354 hits, 280 misses, 378 trims, 440 created
     36 failures (0 no memory)
VeryBig buffers, 4520 bytes (total 10, permanent 10):
     10 in free list (0 min, 100 max allowed)
     28902 hits, 3 misses, 1 trims, 1 created
     3 failures (0 no memory)
Large buffers, 5024 bytes (total 0, permanent 0):
     0 in free list (0 min, 10 max allowed)
     0 hits, 3 misses, 1 trims, 1 created
     3 failures (0 no memory)
Huge buffers, 18024 bytes (total 0, permanent 0):
     0 in free list (0 min, 4 max allowed)
     0 hits, 3 misses, 1 trims, 1 created
     3 failures (0 no memory)

If I look at "show buf" on some of my AS5300's they have lots more 
failures, but aren't having any OSPF problems.


----------------------------------------------------------------------
 Jon Lewis *jlewis at lewis.org*|  I route
 Senior Network Engineer     |  therefore you are
 Atlantic Net                |  
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