WARNING:
Executing show cdp neighbors detail may crash your Cisco at Mae-EAST. I
noticed this earlier today while I was browsing, but believed I had some
sort of strange interaction with my rev of IOS until this happened to
someone else running a completely different code stream.
There is apparently a device there spewing broken cdp information. The
Cisco engineer working on this case hasn't heard of this problem before,
but if I gather anymore useful information I'll certainly pass it along.
-Golan
Why on EARTH?!? would _ANYONE_ run CDP at a MAE or any other exchange point?
Especially given the congestion, and other problems at the MAE's, why run
a protocol to discover other Cisco's you have to explicitly configure peering
sessions with anyway? If someone can explain a reason not to turn off CDP
at an exchange point, I'm all ears.
Owen
Owen DeLong wrote:
Why on EARTH?!? would _ANYONE_ run CDP at a MAE or any other exchange point?
because it's on by default?
-peter
Why on EARTH?!? would _ANYONE_ run CDP at a MAE or any other exchange point?
You would be suprised at the large number of folks who've got CDP enabled
at the exchange points -- Ironically, we enabled it to get a sense of what
other IOS versions were running on our peers routers prior to a code
upgrade to fix some issues that were affecting us.
Especially given the congestion, and other problems at the MAE's, why run
a protocol to discover other Cisco's you have to explicitly configure peering
sessions with anyway? If someone can explain a reason not to turn off CDP
at an exchange point, I'm all ears.
Given that its on by default cdp needs to either be turned off completely,
or disabled for a particular interface, folks probably just leave it on.
I highly doubt CDP contributes to congestion problems with the little
amount of traffic it generates - Although if you've ever looked at some of
the traffic at the Mae's you'd be sickened by all of the other things
floating around.
I suppose another eason to disable CDP in addition to disabling any
non-essencial traffic and/or processes would be for privacy.
Among many other things, CDP has been used very effectively in the past to
see if routing anomalies are correlated with router/software versions.
randy