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Using rrdgraph’s –right-axis options
So, say I have an interface that's dropping packets. Not too many, but the ideal number is zero, so I'd like to see them in the graphs in our NMS (which is based on rrdtool as all decent NMSes are). I...
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Configuring [Custom] Syslogs on a Cisco ASA 5550
Configuring logging on a Cisco ASA 5550 isn’t too tricky, but I found the docs lacking in examples, so figured I’d post mine. Using the Cisco ASDM, the parameters you need to modify are in the...
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Altering [Custom] Syslogs on a Cisco ASA 5550
Since last time, I’ve made a couple of additions to my event list, and my custom logging filter now looks like this: vpn# sh run | include logg logging enable logging timestamp logging list gabs_test...
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Friday Snark – Cisco’s VTP MIB
OK, Cisco, what.is.up. with the CISCO-VTP-MIB? Let’s look at the vtpVersion OID, for starters. One would expect that it would contain, maybe, the vtp version running on the host, right? Check this out,...
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Get Cisco Serial Numbers with SNMP
A friend asked me how to go about doing this, and I figured I’d post it here so he can find it again if he needs it. You’ve already discovered that snmp-server chassis-id is a user-maintained field and...
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Configuring Cisco IP SLA for jitter
We’ve been playing around with IP SLAs at work lately (here’s a quick overview of SLAs and what they can do for you). Right now we’re mainly interested in monitoring VOIP services, so we set up an SLA...
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Monitoring Cisco IP SLAs: rrdtool
Last week I set up an SLA to monitor jitter & looked at the stats available on the command line. This week, I’ll graph those stats. Like I mentioned, this is quick-and-dirty monitoring, just meant...
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Monitoring Cisco IP SLAs: syslog messages
Now that I have an SLA in place, and have some baseline data, I want some notifications in case my SLAs drop. I’ll cover basic syslog messages here, and SNMP traps in another post. Cisco’s docs have a...
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This is what counter rollover looks like.
A friend came to me about a performance monitoring tool he was using for his routers; he was concerned that his traffic in/out graphs for his 10G linkes weren’t matching up nicely with the values he...
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CVOICE+QoS
When I first started diving into QoS, I really hated it. There are a lot of moving parts, and whenever I poked at it I felt like I was sticking my hand in a moving engine. I had the opportunity to take...
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