08-06-2007 06:15 AM - edited 03-05-2019 05:44 PM
Hi all,
Recently implemented a new 2801 802.1q trunk to a 2950 switch, every 3 seconds we get a burst of around 1,000 input errors on the 2801 router, but nothing shown on the interface on the switch.
We've replaced:
2801 router
Cables between the two (twice)
swapped the ports on the 2950 switch (swapping out isn't really a simple option at present)
Can anyone suggest why we might be seeing this as it seems a very standard setup, and one that we have in many other sites without problems.
2801 config:
interface FastEthernet0/1
description Switch LAN
no ip address
speed 100
full-duplex
!
interface FastEthernet0/1.1
encapsulation dot1Q 1 native
ip address 10.10.10.1 255.255.255.248
no snmp trap link-status
on the 2950:
interface FastEthernet0/1
description **UPLINK**
switchport trunk allowed vlan 1,123,126,140,142,152
switchport mode trunk
speed 100
duplex full
!
Help!!
08-06-2007 06:43 AM
Silly me, it helps if I show you the output of sh int fe0/1 on the 2801 router:
FastEthernet0/1 is up, line protocol is up
Hardware is Gt96k FE, address is 001b.d4a8.e9ef (bia 001b.d4a8.e9ef)
Description: Switch LAN
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 2/255, rxload 1/255
Encapsulation ARPA, 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 never
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 494000 bits/sec, 201 packets/sec
5 minute output rate 1037000 bits/sec, 194 packets/sec
3319239 packets input, 1095006885 bytes
Received 395281 broadcasts, 0 runts, 0 giants, 0 throttles
2990410 input errors, 1525 CRC, 0 frame, 1 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
3247271 packets output, 2459860913 bytes, 0 underruns
0 output errors, 0 collisions, 4 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
And on the 2950 switch:
FastEthernet0/2 is up, line protocol is up (connected)
Hardware is Fast Ethernet, address is 0013.7f66.2a42 (bia 0013.7f66.2a42)
Description: **UPLINK**
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 1/255, rxload 2/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, media type is 100BaseTX
input flow-control is unsupported output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:01, output 00:00:00, output hang never
Last clearing of "show interface" counters 23w5d
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 1176000 bits/sec, 214 packets/sec
5 minute output rate 544000 bits/sec, 216 packets/sec
31641533 packets input, 3327594976 bytes, 0 no buffer
Received 2236903 broadcasts (0 multicast)
0 runts, 0 giants, 0 throttles
12 input errors, 8 CRC, 4 frame, 0 overrun, 0 ignored
0 watchdog, 218798 multicast, 0 pause input
0 input packets with dribble condition detected
133611358 packets output, 1567316521 bytes, 0 underruns
0 output errors, 368 collisions, 2 interface resets
0 babbles, 0 late collision, 1691 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out
08-06-2007 09:55 AM
On your switch port interfaces, apply the
"switchport trunk encapsulation dot1q"
Hope this help.
08-06-2007 11:38 PM
Thanks for the advice, however this is a new 2950 switch, with new IOS (12.1(22)EA2) which uses dot1q as native, so doesn't need or accept this statement.
Encapsulation is definately working, as the switch/trunks are operating perfectly, just the errors.
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: