There's no reason not to use regular expressions for ALL of the
troubleshooting steps you mentioned:
#1
HOSTNAME#show ip ospf | i Area|execute
Area BACKBONE(0)
Area has no authentication
SPF algorithm executed 21 times
Area ranges are
HOSTNAME#
#2
HOSTNAME#show processes cpu | i OSPF Hello
2 165116 1340327 123 0.00% 0.00% 0.00% 0 OSPF Hello
HOSTNAME#
----- Original Message -----
From: "Kelly Cobean"
To:
Sent: 21 June 2002 7:34 pm
Subject: RE: OSPF, when is it time for more than area 0 (try 2) [7:47165]
> Here are some commands you can run, and their significance in determining
> whether your OSPF Area 0 routers are working too hard or not:
>
> #show ip ospf:
> Look for:
> "SPF algorithm executed xxx times" - I don't know what constitutes
a
> high number, but if it's in the hundreds or thousands after a relatively
> short period of time, that means that instabilities in your network are
> causing the routers to frequently run the Dijkstra (SPF) algorithm, which
is
> a very processor intensive process.
>
> #show processes cpu:
> Look for:
> "OSPF Hello" - Again, I'm not sure what "high" is, but one of our
> routers that has 1 Broadcast interface, and 13 Point-to-point interfaces
> holds steady at 0.06% processor utilization. Anyone care to chime in on
> what a high number for this process would be?
> "OSPF Router" - This is the one that will spike during SPF
> calculation, so watch the 5 minute utilization here, if you see it
> consistently high, that probably means it's time to move to multi-area
OSPF
>
> #show processes memory | include OSPF: (the "| include OSPF" just helps
> minimize the junk)
> Look for:
> OSPF Hello & OSPF Router - Not real sure about OSPF Hello, but I believe
the
> memory counter for OSPF router indicates the size of your databases. If
you
> find these growing large enough to start running the router out of memory,
> it's time to move to multi-area OSPF (again, I don't know what size of
> network it would take to do this, sorry. Any takers on that one?)
>
>
> The number of SPF calculations and CPU utilization are the two big ones to
> watch our for (and are directly linked to one another) If you see lots of
> re-calc's and they are holding your processor hostage, then you should
start
> thinking about redesign.
>
>
> HTH,
> Kelly Cobean
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> bergenpeak
> Sent: Friday, June 21, 2002 8:09 AM
> To: [EMAIL PROTECTED]
> Subject: OSPF, when is it time for more than area 0 (try 2) [7:47129]
>
>
> I've got a rather large OSPF area 0 network with no non-zero
> areas. This network will continue to grow both in number of
> network elements and number of subnets on these routers.
>
> What commands, and specifically, what information provided by
> these commands, will give me insight as to whether these routers
> are nearing the point, from a routing perspective, that its time
> to segement the network in some fashion?
>
> Thanks
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=47202&t=47202
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