Cisco routers on an Ethernet interface send a keepalive frame to themselves
every 10 seconds by default. Sniffers call the packets loopbacks. They are
no big deal. They just appear to be a lot of traffic when you first see it
with a sniffer. They use very little bandwidth and are not sent as
broadcast, so it's not a problem.
Priscilla
At 02:10 PM 2/17/01, yong choonhwa wrote:
>Hi,
>
>Recently, I done a snffing in my network and it showed a warning -same
>source destination which I happen to found out is the cisco router doing a
>loopback every 10 min to itself (router 1720).
>However I have check the fasteth interface, no loopback been set and no
>debug on.
>Is this a common sign?
>Can someone enlighten me on this?
>
>thank you
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