I have a Catalyst 5500 and a Catalyst 2900XL. The 2900XL is linked from ports f0/23 and f0/24 to 5500 ports 3/3 and 3/4. Assuming that all the duplex, speed, and VLAN settings are the same on all four ports, should the configuration be like below?
switch(enable) set port channel 3/3 mode on
switch(enable) set port channel 3/4 mode on
Do I need to add the two ports to an admin group first?
Also, can somebody help me with the config on the 2900XL using IOS 12.0?
Firstly can the H/W support etherchannel, depending on OS running you can issue a sh port cap 3/3 and sh port cap 3/4. This will tell you if the H/W is capable.
Also i have in the past had problem creating a channel with last two ports in the EBC, the EBC is grouped into ports of 4, and if you have no channel omn the 1st two then it would not channel on the second.
i found a DOC to prove the above theory:
EtherChannel port bundle must consist of two or four contiguous ports on the same module. The ports in an EtherChannel must belong to the same port group (ports that share the same EtherChannel controller).
NB!!!! Depending on the hardware, there might be additional restrictions. For example, on certain modules, you cannot form an EtherChannel with the last two ports in a port group unless the first two ports in the group already form an EtherChannel with the exception of the module (WS-X5010) then an EtherChannel bundle can consist of any two to eight ports on the module. Ports in an EtherChannel do not have to be contiguous.
As for the 2900XL, it all depends on what you are trying to do. If it's the Etherchannel then make sure you make them trunks and switchports then pile them into a common group.
You do not have to change at all, however just a note:
ISL is Cisco Specific and has more overhead in terms of bytes per frame than dot1q. So at the end of the day to stick with Standards and "vendor interop" i would move to dot1q for better QoS mapping etc and also There is no ISL on GIG to the best of my knowledge.
Also Cisco has included 802.1w/s which allows Multiple Spanning Tree instances over a dot1 trunk, the original IEEE doc stated that 802.1 device runs only a single SPT instance for all VLAN's, this has been modified by 802.1s.
According to a Cisco doc I have read, you must disable the 5500 port whilst configuring FEC. This is so that Spanning Tree does not form a loop. I have configured FEC on my access layer switches, and can I now go ahead and configure FEC on 5500? I recieved a lot of MLS errors when I configured the port groups on the access layer switch, plus the link went down for 5 minutes. Is this normal?
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