Monitoring OSPF

[Ondrej Zajicek]

On Thu, Sep 08, 2011 at 09:52:02AM +0200, Ruben Laban wrote:
> Hi list,
> 
> I was wondering if there's a sane method to keep a realtime eye on OSPF. More 
> specifically, getting notifications for link/state/topology/etc changes. So far 
> all I could think of is using birdc(6) every x seconds/minutes and comparing 
> the output with the previous run to detect changes.

There is no dedicated notification channel. The simplest thing is to get output
of 'show ospf state' every x seconds. Or if you want, you could enable debug
events logging and use routing the table recalculation message as a trigger for
'show ospf state' (but that seems unnecessary for me).

For monitoring, i have a script that logs the state, sorts that appropriately
to hide irrelevant changes, compares with the previous one and possibly sent
the diff (attached, just a quick hack).

I have also some scripts that took 'show ospf state' output and expected
network description and converts that to the SVG image with reachable,
broken and unreachable links differentiated by color, but it is not
really finished.

-- 
Elen sila lumenn' omentielvo

Ondrej 'SanTiago' Zajicek (email: santiago at crfreenet.org)
OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
"To err is human -- to blame it on a computer is even more so."
-------------- next part --------------
#!/bin/bash

EMAIL=santiago

while true ;
do
    F1=log/`date '+%F-%H-%M-%S'`
    F2=${F1}s
    birdc4 show ospf state | grep -v 'dr ' > $F1

    csplit -ftmp/x -n3 $F1 '/^$/' '{*}' > /dev/null
    for A in tmp/* ;
    do
	sort ${A} > ${A}s
    done

    cat tmp/*s > $F2
    rm tmp/*

    if [ -n "`diff log/00last $F2`" ]
    then
	diff -u log/00last $F2 | mail -s 'OSPF Change' $EMAIL
	mv $F2 log/00last
    else 
	rm $F1 $F2
    fi

    sleep 10;
done
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 197 bytes
Desc: Digital signature
URL: <http://trubka.network.cz/pipermail/bird-users/attachments/20110909/9df200b4/attachment-0001.asc>