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Etherchannel 3550 to 3500xl

Posted on 2011-02-13
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Last Modified: 2012-05-11
I am trying to setup Etherchannel between a 3550 and a 3500xl switch but I can't get it working.  There is a significant difference between the 2 switches how it is supposedly configured so I don't know if it's even 'compatible'.  Anyway here is my config.

3550#sh run
interface Port-channel3
 switchport mode dynamic desirable
!
interface FastEthernet0/1
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 10
 switchport mode trunk
 channel-group 3 mode desirable
!
interface FastEthernet0/2
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 10
 switchport mode trunk
 channel-group 3 mode desirable

3550#sh int po3
Port-channel3 is down, line protocol is down (notconnect)
  Hardware is EtherChannel, address is 0000.0000.0000 (bia 0000.0000.0000)
  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Auto-duplex, Auto-speed, media type is 10/100BaseTX
  input flow-control is off, output flow-control is unsupported
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input never, output never, 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 0 bits/sec, 0 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     0 packets input, 0 bytes, 0 no buffer
     Received 0 broadcasts (0 multicast)
     0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog, 0 multicast, 0 pause input
     0 input packets with dribble condition detected
     0 packets output, 0 bytes, 0 underruns
     0 output errors, 0 collisions, 3 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier, 0 PAUSE output
     0 output buffer failures, 0 output buffers swapped out

3500xl-A#sh run
interface FastEthernet0/3
 port group 3
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1,10,1002-1005
 switchport mode trunk
!
interface FastEthernet0/4
 port group 3
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 1,10,1002-1005
 switchport mode trunk

3500xl-A#sh port group
Group  Interface              Transmit Distribution
-----  ---------------------  ---------------------
    3  FastEthernet0/3        source address
    3  FastEthernet0/4        source address

As a side note, I do have Etherchannel working perfectly between other 3500xl switches in my test lab, it just won't work between the 3550 and the 3500xl.   Right now they are all daisy chained as such:
3550 == 3500xl == 3500xl == 3500xl
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Question by:B1izzard
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Accepted Solution

by:
Fidelius earned 500 total points
ID: 34884295
Hello,

Note: Catalyst 2900XL/3500XL switches do not support DTP (Dynamic Trunk Protocol).
http://www.cisco.com/en/US/products/hw/switches/ps607/products_configuration_example09186a0080094789.shtml

Do you need to change under interface config on 3550:
channel-group 3 mode desirable
to:
channel-group 3 mode on  

And configure:
interface Port-channel3
  flowcontrol send off
  switchport mode trunk

0
 

Author Closing Comment

by:B1izzard
ID: 34884421
Awesome!   That was it.  Thanks!
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