[c-nsp] ARP requests

Gert Doering gert at greenie.muc.de
Wed Aug 19 12:21:21 EDT 2020


On Wed, Aug 19, 2020 at 10:03:29PM +0700, Eugene Grosbein wrote:
> I have not such routes: the command "show ip route | include 0/1$" shows nothing.
> The interface Gi0/1 does not have any IP configuration itself, only its sub-interfaces have.

Do you have a subinterface with no "encaps dot1q ..." configured?  That
would be "untagged" then.

Otherwise, ask the router - "debug arp" - and for each ARP request you
see it issue, check the routing whether it points directly to an 

(And never believe what switches say about tagging vs. not)


"If was one thing all people took for granted, was conviction that if you 
 feed honest figures into a computer, honest figures come out. Never doubted 
 it myself till I met a computer with a sense of humor."
                             Robert A. Heinlein, The Moon is a Harsh Mistress

Gert Doering - Munich, Germany                             gert at greenie.muc.de
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