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Create Link aggregations between two 3com switches

Posted on 2011-03-01
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Last Modified: 2012-12-05
Hi Experts,

I have 2 x 3com switches, the model are 5500G and 4800G. I current have one cat5e between them. I'd like to have a second cat5e to help the traffic flow between 2 switches. How do I create the aggregation links between 2 switches? Thanks.
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Question by:SJCA
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roger_karam earned 500 total points
ID: 35013728
For static Link aggregation:

4800G (where x and y are the ports you want to aggregate)

system view
interface bridge-aggregation 1
quit

interface gigabitEthernet 1/0/x
port link-aggregation group 1

interface gigabitEthernet 1/0/y
port link-aggregation group 1

5500G

system-view
link-aggregation group 1 mode manual

interface gigabitEthernet 1/0/x
port link-aggregation group 1

interface gigabitEthernet 1/0/y
port link-aggregation group 1
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Expert Comment

by:roger_karam
ID: 35013734

check that it is set and working: display link-aggregation summary / display lacp statistics

Don't forget that individual port settings should be the same (vlans, stp, trunk, etc.) in case only one link is left. You can add all the vlans you want to the ports and set the aggregated link as a trunk if you need vlan trunk (setting all ports makes sure that it works in case one cable is disconnected):

Ex. with vlan 10/20
system-view
vlan 10
port gigabitEthernet 1/0/x
port gigabitEthernet 1/0/y
quit

vlan 20
port gigabitEthernet 1/0/x
port gigabitEthernet 1/0/y
quit

interface bridge-aggregation 1
port-link type trunk
port trunk permit vlan 10 20
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Author Comment

by:SJCA
ID: 35018198
Roger,

What is the different between static and dynamic link aggregation? Would you mind to tell me why would you choose static in this case?
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Expert Comment

by:roger_karam
ID: 35018590
Static link aggregation is manually configured - you put in the ports, speeds, etc. It is more stable than dynamic and less susceptible to having issues in case one port is disconnect or has problems.

Dynamic link aggregation is automatically configured through LACP - theoretically you enable it on the ports and when you connect two ports to the same equipment, it will configure a link aggregation by itself. It is less stable, however in theory you don't have to worry so much about the cabling/managing.

The reason I went with static is that specifically the 4800G you still have to say which ports are going to be in the link aggregation, so there is little benefit compare to static. Now for the 5500G, all you have to do is enable it.

I will post a dynamic config asap
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Expert Comment

by:roger_karam
ID: 35018810
dynamic:

4800G (where x and y are the ports you want to aggregate)

system view
interface bridge-aggregation 1
link-aggregation mode dynamic
quit

interface gigabitEthernet 1/0/x
port link-aggregation group 1

interface gigabitEthernet 1/0/y
port link-aggregation group 1

5500G

system-view

interface gigabitEthernet 1/0/x
lacp enable

interface gigabitEthernet 1/0/y
lacp enable


*please note that the 5500G also supports a "static LACP mode" which is configured just like manual, but exchanging the word "manual" for "static". The difference is that static LACP is more like the 4800G version, where although there is LACP running, the ports are still manually configured.
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Author Comment

by:SJCA
ID: 35039386
Roger_Karam,

I would go with static configuration for now, please let me know if I have them wrong.

Switch 5500G:
link-aggregation group 1 mode static

interface GigabitEthernet1/0/1
 port link-type trunk
 port trunk permit vlan 3 5 7
 port trunk pvid vlan 3
 port link-aggregation group 1
 apply qos-profile default

#
interface GigabitEthernet1/0/2
 port link-type trunk
 port trunk permit vlan 3 5 7
 port trunk pvid vlan 3
 port link-aggregation group 1
 apply qos-profile default
#

=================

Switch 4800G:
Interface Bridge-Aggregation 1
Port link –type trunk
Port trunk permit vlan 3 5 7
port trunk pvid vlan 3
Link-aggregation mode static

interface GigabitEthernet1/0/1
 Port trunk permit vlan 3 5 7
 port trunk pvid vlan 3
 Port link-aggregation group 1

#
interface GigabitEthernet1/0/2
 Port trunk permit vlan 3 5 7
 port trunk pvid vlan 3
 Port link-aggregation group 1

Thanks.
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Expert Comment

by:roger_karam
ID: 35039549
Hello SJCA. Looks good to me.
Good luck!
-RK
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Expert Comment

by:ratocego
ID: 38661866
On our stacked 5500G, dynamic aggregation works well for all ports except SFP, when we spread links across different units. In this case we end up with lots of one port aggregations. So static might be a better idea in these scenarios...
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