[c-nsp] 7505<->3524 CRC issue

[Jens S Andersen]

The errors are caused by the keepalives from the 7505

-Jens

>Hello,

>I am seeing an issue between a 3524 and a 7505.  The 7505 side of the
>connection is not seeing any errors but the 3524's interface is
>showing about 6 input errors per minute.

>This combo is part of a redundant setup and the other 7505-3524 pair
>is seeing the same types of errors, though the input rate to the
>switch is about half and so is the number of input errors.

>Is this a hardware issue?  Capacity issue?  Other?

>Thanks,
>Chris

>7505
>IOS (tm) RSP Software (RSP-JSV-M), Version 12.3(19), RELEASE SOFTWARE (fc2)

>7505 fa3/0/0
>FastEthernet3/0/0 is up, line protocol is up
>  Hardware is cyBus FastEthernet Interface, address is 0050.a29b.fc60
>(bia 0050.a29b.fc60)
>  Description: to external switches (vLan trunk interface)
>  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
>     reliability 255/255, txload 43/255, rxload 78/255
>  Encapsulation 802.1Q Virtual LAN, Vlan ID  1., loopback not set
>  Keepalive set (10 sec)
>  Full-duplex, 100Mb/s, 100BaseTX/FX
>  ARP type: ARPA, ARP Timeout 04:00:00
>  Last input 00:00:00, output 00:00:00, output hang never
>  Last clearing of "show interface" counters 3d22h
>  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 30907000 bits/sec, 22323 packets/sec
>  5 minute output rate 17182000 bits/sec, 11224 packets/sec
>     1989309927 packets input, 2061920000 bytes, 0 no buffer
>     Received 245076 broadcasts, 0 runts, 0 giants, 0 throttles
>     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
>     0 watchdog
>     0 input packets with dribble condition detected
>     947682645 packets output, 1228149038 bytes, 0 underruns
>     0 output errors, 0 collisions, 0 interface resets
>     0 babbles, 0 late collision, 0 deferred
>     0 lost carrier, 0 no carrier
>     0 output buffer failures, 0 output buffers swapped out

>interface FastEthernet3/0/0
> no ip address
> speed 100
> full-duplex
>end

>[multiple subif like the following]
>interface FastEthernet3/0/0.100
> encapsulation dot1Q 100
> ip address a.b.c.d 255.255.255.252
> no cdp enable
>end

>interface FastEthernet3/0/0.900
> description in-band switch management vLan
> encapsulation dot1Q 900
> ip address 192.168.1.2 255.255.255.0
> no cdp enable
> standby 1 ip 192.168.1.1
> standby 1 preempt
> standby 1 authentication 12345
>end

>3524
>IOS (tm) C3500XL Software (C3500XL-C3H2S-M), Version 12.0(5)WC11,
>RELEASE SOFTWARE (fc1)

>3524 fa0/1
>FastEthernet0/1 is up, line protocol is up
>  Hardware is Fast Ethernet, address is 0006.289f.2c81 (bia 0006.289f.2c81)
>  Description: To 7505
>  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
>     reliability 255/255, txload 79/255, rxload 43/255
>  Encapsulation ARPA, loopback not set
>  Keepalive not set
>  Full-duplex, 100Mb/s, 100BaseTX/FX
>  ARP type: ARPA, ARP Timeout 04:00:00
>  Last input never, output 00:00:00, output hang never
>  Last clearing of "show interface" counters 00:34:14
>  Queueing strategy: fifo
>  Output queue 0/40, 0 drops; input queue 0/75, 0 drops
>  5 minute input rate 16962000 bits/sec, 10986 packets/sec
>  5 minute output rate 31234000 bits/sec, 22148 packets/sec
>     22898256 packets input, 252912089 bytes
>     Received 687 broadcasts, 0 runts, 0 giants, 0 throttles
>     231 input errors, 231 CRC, 0 frame, 270 overrun, 270 ignored
>     0 watchdog, 687 multicast
>     0 input packets with dribble condition detected
>     46728995 packets output, 4018643324 bytes, 0 underruns
>     0 output errors, 0 collisions, 0 interface resets
>     0 babbles, 0 late collision, 0 deferred
>     0 lost carrier, 0 no carrier
>     0 output buffer failures, 0 output buffers swapped out

>CPU utilization for five seconds: 40%/4%; one minute: 39%; five minutes: 39%

>interface FastEthernet0/1
> description To 7505
> duplex full
> speed 100
> switchport trunk encapsulation dot1q
> switchport trunk native vlan 998
> switchport trunk allowed vlan 1-997,1002-1005
> switchport mode trunk
> spanning-tree portfast
>end
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Jens S Andersen                 Email:  jsa at adm.aau.dk
Aalborg University              Telf:   9635 9464
Fredrik Bajers Vej 5            Fax:    9815 6970
9220 Aalborg
Denmark