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Memory utilisation: IP Input/ARP of WS-C2950-24

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I have a Cisco WS-C2950-24 IOS version 12.1(12c)EA1 (no VLAN, only
default) switch witch connects to a Cisco router (to Internet), 3 NAS,
and 4 Linux hosts.

The 'IP Input' on the switch seems to be taking up quite a bit of RAM.

PID TTY Allocated Freed Holding Getbufs Retbufs Process
26 0 38491484 1668836 4054528 399960 148992 IP Input

The switch only complains about SYS-3-CPUHOG process = ARP Input when
RAM utilisation is high.

Also, the switch, on a regular basis, ARP process takes up a bit of CPU
cycles. Then it drops back to normal (<1%) - looks to be related to RAM

PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
9 264861720 28719280 9222 40.86% 5.62% 4.17% 0 ARP Input

Problem startd when 3 NAS went into production.

However, if I add 'no ip proxy-arp' on the router interface that
connects the switch, IP Input RAM utilisation drops, ARP process @ < 1%,
but then it will break PING. ie. I can not ping the 4 Linux hosts.
There is about 250 dial users on those NAS.

I have ACLs on the router and NAS to deny worms as mentioned on Cisco
www site.

Does, approx. 4Mb of RAM for IP Input look about right in this
situation? Or is there something wrong?

Any comment appreciated.

NAS interface to switch ...

interface FastEthernet0
description Uplink to Switch
ip address x.x.x.x x.x.x.x
ip access-group 115 in
ip access-group 115 out
no ip unreachables
no ip proxy-arp
no ip route-cache
no ip mroute-cache
duplex full
speed 100
no cdp enable

and router interface to switch

interface FastEthernet2/1
description Connects to switch
ip address x.x.x.x x.x.x.x
no ip redirects
no ip route-cache
no ip redirects
duplex full
speed 100
no cdp enable

Thanks and regards,

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