Input errors when trunking a 2950 and a 2900xl

Chris Knight

Guys I need some help, I am trying to trunk the two switches via ports fa 0/12 on 2900xl and fa 0/24 on 2950 switch

Basically what then starts to happen is i am performing a sh int fa 0/12 and watching the input errors skyrocket everytime I refresh. Not sure what I am doing wrong

I am performing a switchport mode trunk on the ports and I cannot specify encaps on the 2950 as it only has 802.1q. And I believe the 2900 xl does only 802.1q.

So I cant specify the encapsulations... Any thoughts? Try trunking another port?

FastEthernet0/12 is up, line protocol is up
Hardware is Fast Ethernet, address is 0007.8531.e74c (bia 0007.8531.e74c)
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 216/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:42, output 00:00:00, output hang never
Last clearing of "show interface" counters 00:11:47
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 0 bits/sec, 0 packets/sec
5 minute output rate 1000 bits/sec, 1 packets/sec
370 packets input, 38745 bytes
Received 84 broadcasts, 0 runts, 0 giants, 0 throttles
113 input errors, 113 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 84 multicast
0 input packets with dribble condition detected
678 packets output, 51997 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier

bighornsheep

You need to encap the 2900XL, it supports both ISL & dot1q

Chris Knight

Im in config interface and there is no encapusulation command

Chris Knight

Com(config)#int fa 0/12
Com(config-if)#en ?
% Unrecognized command
Com(config-if)#?
Interface configuration commands:
arp Set arp type (arpa, probe, snap) or timeout
bandwidth Set bandwidth informational parameter
carrier-delay Specify delay for interface transitions
cdp CDP interface subcommands
custom-queue-list Assign a custom queue list to an interface
default Set a command to its defaults
delay Specify interface throughput delay
description Interface specific description
duplex Configure duplex operation.
exit Exit from interface configuration mode
fair-queue Enable Fair Queuing on an Interface
help Description of the interactive help system
hold-queue Set hold queue depth
ip IP interface commands
keepalive Enable keepalive
load-interval Specify interval for load calculation for an
interface
logging Configure logging for interface
loopback Configure internal loopback on an interface
mac-address Manually set interface MAC address
max-reserved-bandwidth Maximum Reservable Bandwidth on an Interface
mtu Set the interface Maximum Transmission Unit (MTU)
negotiation Select Autonegotiation mode
no Negate a command or set its defaults
port Perform switch port configuration
priority-group Assign a priority group to an interface
random-detect Enable Weighted Random Early Detection (WRED) on an
Interface
rmon Configure Remote Monitoring on an interface
service-policy Configure QoS Service Policy
shutdown Shutdown the selected interface
snmp Modify SNMP interface parameters
spanning-tree Spanning Tree Subsystem
speed Configure speed operation.
switchport Set switching mode characteristics
timeout Define timeout values for this interface
transmit-interface Assign a transmit interface to a receive-only
interface
tx-queue-limit Configure card level transmit queue limit
udld Configure UDLD enabled or disabled and ignore global
UDLD setting

Netstudent

try switchport trunk encapsulation dot1q

Chris Knight

Doh that was it.. I cleared the counters and kept refreshing, no input errors....

Very nice