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Saturday, April 30, 2011

Cisco switch 10Mb port and trunk question in 1900 series

Can the trunk will form between two 10 Mbs ports. I performed the lab in gns3 where i configured the port speed 10 Mbs and found out trunk indeed did form. But i remember performing a lab using old 1900 series switches which had only 10 Mbs port where i tried to form a trunk and could not form it. It is just my memory relapsing or switches with 10 Mbs ports can not form trunk.


Make sure that the C1900 can support multiple VLANs. You can try this.

SW1#sh int f0/13 status

Port Name Status Vlan Duplex Speed Type
Fa0/13 connected trunk a-full 10 10/100BaseTX

SW1#sh int f0/13 trun

Port Mode Encapsulation Status Native vlan
Fa0/13 on 802.1q trunking 1

Port Vlans allowed on trunk
Fa0/13 1-4094

Port Vlans allowed and active in management domain
Fa0/13 1-7,10,16,26,29,33,36,44,52,57,63,80,255,783

Port Vlans in spanning tree forwarding state and not pruned
Fa0/13 none

Real switch

SW1#sh ver | i WS
cisco WS-C3560-48TS (PowerPC405) processor (revision D0) with 118784K/12280K bytes of memory.
Model number : WS-C3560-48TS-E
* 1 52 WS-C3560-48TS 12.2(25)SEB4 C3560-IPSERVICES-M
SW1#

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