[c-nsp] Input errors on SVIs (c2950)

[Sam Stickland]

We've seen a possibly related issue, where the SVIs would show a lot of
input queue drops, but it wasn't related to any queue drops on any
associated physical interfaces or load (CPU or bandwidth)

Ours was just cosmetic - never got to the bottom of it.

S

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of David J. Hughes
> Sent: 04 May 2006 23:13
> To: Cisco NSP
> Subject: [c-nsp] Input errors on SVIs (c2950)
> 
> 
> On many, many 2950 class switches we are seeing interface input errors
> on the management SVI.  However there are no corresponding errors on
> any physical interfaces.   The traffic rates to the SVI's are very,
> very low.  Just a telnet / ssh session to the switches can generate
> these errors.  It's not an environmental issue as we are seeing these
> problems at several different locations.  Buffers look fine (no errors)
> and there's nothing being logged.  We are seeing this on boxes running
> 12.1(22)EA2, EA4 and EA7.  This isn't just a cosmetic issue as we are
> seeing it impact upon our management / monitoring traffic.
> 
> Has anyone seen this or similar before?
> 
> 
> Thanks
> 
> David
> ...
> 
> ---
> sw47.bne#sh int vlan 999
> Vlan999 is up, line protocol is up
>    Hardware is CPU Interface, address is 0008.a372.4e00 (bia
> 0008.a372.4e00)
>    Description: Network Management
>    Internet address is XXX.XXX.XXX.XXX/XX
>    MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
>       reliability 150/255, txload 1/255, rxload 1/255
>    Encapsulation ARPA, loopback not set
>    ARP type: ARPA, ARP Timeout 04:00:00
>    Last input 00:00:00, output never, output hang never
>    Last clearing of "show interface" counters 06:25:09
>    Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
>    Queueing strategy: fifo
>    Output queue: 0/40 (size/max)
>    5 minute input rate 24000 bits/sec, 83 packets/sec
>    5 minute output rate 4000 bits/sec, 7 packets/sec
>       1911814 packets input, 69434847 bytes, 0 no buffer
>       Received 178644 broadcasts (0 IP multicast)
>       0 runts, 0 giants, 53 throttles
>       872646 input errors, 0 CRC, 0 frame, 0 overrun, 89322 ignored
>       159551 packets output, 30854840 bytes, 0 underruns
>       0 output errors, 0 interface resets
>       0 output buffer failures, 0 output buffers swapped out
> 
> sw47.bne#sh buffer
> Buffer elements:
>       498 in free list (500 max allowed)
>       291381912 hits, 0 misses, 0 created
> 
> Public buffer pools:
> Small buffers, 104 bytes (total 32, permanent 25, peak 55 @ 7w0d):
>       31 in free list (20 min, 60 max allowed)
>       574777070 hits, 3347 misses, 9070 trims, 9077 created
>       0 failures (0 no memory)
> Middle buffers, 600 bytes (total 24, permanent 15, peak 57 @ 2d12h):
>       23 in free list (10 min, 30 max allowed)
>       4030062 hits, 8080 misses, 24228 trims, 24237 created
>       0 failures (0 no memory)
> Big buffers, 1524 bytes (total 6, permanent 5, peak 27 @ 7w0d):
>       6 in free list (5 min, 10 max allowed)
>       797198 hits, 38485 misses, 20961 trims, 20962 created
>       20797 failures (0 no memory)
> VeryBig buffers, 4520 bytes (total 10, permanent 0, peak 22 @ 3w0d):
>       10 in free list (0 min, 10 max allowed)
>       2433075 hits, 2893 misses, 545 trims, 555 created
>       2881 failures (0 no memory)
> Large buffers, 5024 bytes (total 1, permanent 0, peak 6 @ 7w0d):
>       1 in free list (0 min, 5 max allowed)
>       2084 hits, 797 misses, 2015 trims, 2016 created
>       797 failures (0 no memory)
> Huge buffers, 18024 bytes (total 1, permanent 0, peak 3 @ 7w0d):
>       1 in free list (0 min, 2 max allowed)
>       325 hits, 472 misses, 1951 trims, 1952 created
>       472 failures (0 no memory)
> 
> Interface buffer pools:
> Calhoun Packet Receive Pool buffers, 1560 bytes (total 256, permanent
> 256):
>       223 in free list (0 min, 256 max allowed)
>       492189291 hits, 0 misses
> 
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