>I am getting lot of broadcast packets on FastEthernet interface when I >do
>sh interface on cisco 7505.
What does, "Lots," mean? Broadcasts are part of life in a network, cf. ARP,
GNS, SAP, RIP updates, etc.
>I also get "input errors" on that interface
What percentage of your input packets is it? Are they collisions (normal in
an unswitched environment), CRC's, or ?? You may want to check your cabling,
and your speed/duplex settings if the router is plugged into a switch.
>and big ping (up to 1200ms) latency to isdn sites.
Could be caused by many, many things. It's unlikely this has anything to do
with your ethernet interface. You might start by looking for overutilized
circuits causing routers to drop packets from their output queues.
>What to expect if I turn off these broadcasts?
ARP won't work, therefore TCP/IP won't work.
>Do I need receive broadcast packets on interface?
Yes.
HTH,
doctorcisco
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