[c-nsp] CRC errors on fastethernet interface

[Joe Mays]

Have a 7206 connected to a Catalyst 2900XL switch port.

The 2900XL is getting CRC errors on the port at the rate of about one
every one or two seconds. I've tried replacing the cable, no effect.

core-sw1.noc#show int fastethernet0/1
FastEthernet0/1 is up, line protocol is up 
  Hardware is Fast Ethernet, address is 0002.7d2f.bc41 (bia
0002.7d2f.bc41)
  Description: 802.1q trunk to core-gw1.noc.win.net port FastEthernet0/0
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, 
     reliability 255/255, txload 51/255, rxload 37/255
  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 00:05:49
  Queueing strategy: fifo
  Output queue 0/40, 0 drops; input queue 0/75, 0 drops
  30 second input rate 14547000 bits/sec, 2327 packets/sec
  30 second output rate 20099000 bits/sec, 3507 packets/sec
     862330 packets input, 682108246 bytes
     Received 398 broadcasts, 0 runts, 0 giants, 0 throttles
     63 input errors, 63 CRC, 0 frame, 64 overrun, 64 ignored
     0 watchdog, 257 multicast
     0 input packets with dribble condition detected
     1262698 packets output, 899402766 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

Since changing the cable made no difference, it's either a port problem
on the 7206 or 2900XL, or a config problem. Here are the configs for the
interfaces on each end.

(Since the 7206 does not specify 100mbps, I had thought maybe it was
occasionally trying to renegotiate the speed, which might screw up the
switch end, which is hardwired 100-full, while the 7206 is set to
full-duplex, the speed command to force 100mbps speed does not seem to
exist on the 7206.)

Cisco 7206 --

interface FastEthernet0/0
 description Win.net NOC gateway LAN, 911 Heyburn Bldg (via
core-sw1.noc.win.net)
 ip address nnn.nnn.nnn.nnn 255.255.255.192
 ip access-group block-out-to-dot30 out
 no ip proxy-arp
 ip route-cache same-interface
 ip route-cache flow
 ip ospf message-digest-key 1 md5 7 xxxxxxxxxxxxxxxxxxxxxxx
 ip ospf cost 2
 ip ospf priority 200
 no ip mroute-cache
 load-interval 60
 duplex full
 no keepalive
 no cdp enable
 standby 1 ip 216.24.30.65
 standby 1 timers 5 15
 standby 1 priority 105
 standby 1 preempt delay minimum 60
 standby 1 authentication dfwmhsrp
 standby 1 track Serial6/0
 crypto map KYtoINvpn
 service-policy output queue-on-dscp

2900XL

interface FastEthernet0/1
 description 802.1q trunk to core-gw1.noc.win.net port FastEthernet0/0
 load-interval 30
 duplex full
 speed 100
 switchport trunk encapsulation dot1q
 switchport mode trunk
 no cdp enable