[c-nsp] 2950-48-SI arp problems ?

[matthew zeier]

I have two 2950-SIs running Version 12.1(22)EA2.  Switch config is pretty 
simple:

core1/core2 (6905) -- dot1q trunk -- access4 (6905) --- trunk --- 2950 .


Hosts on the 2950 are able to connect to the Internet, however, if idle for 
enough time (something between minutes and less than an hour), the host's 
ARP table becomes empty and the gateway is unable to ping/reach the host (so 
inbound connections are lost).

Running 'tcpdump' on one of the Linux hosts shows that there aren't any 
packets from the gateway reaching the host.  If the host pings the gateway, 
everything works - inbound connectivity is restored.

I've used three different computers (PC laptop & windows, supermicro & 
redhat, mac) with the same problem.  If I replace the 2950 with a 2948, the 
problem appears to go away.

Did I miss the "ip work-all-the-time enable" option?  The 2950's trunk looks 
like:

interface GigabitEthernet0/1
 switchport trunk native vlan 2
 switchport mode trunk
!




--
matthew zeier, Sr. Network Engineer  | "Nothing in life is to be feared.
InteleNet Communications, Inc.       |  It is only to be understood."
(949) 784-7904                       |       - Marie Curie