cisco switch 10Mb port and trunk

[sarahr202]

Hi every body

I was just wondering if 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.

thanks and have a great  weekend

[Edison Ortiz · Accepted solution]

I was just wondering if trunk will form between two 10 Mbs ports.

Sure

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#

[Giuseppe Larosa · Accepted solution]

Hello Sarah,

I may be wrong but those C1900 were not able to support multiple VLANs I had some of them still deployed on a previous customer, and also some of them had a menu based CLI not the usual IOS CLI.

I have been able to make subinterfaces on ethernet 10MB ports of a C3640 also that were half duplex with no chance to become full duplex.

Clearly there can be limitations in a setup like that but it can be handy in a lab for functional tests.

Hope to help

Giuseppe

[Keith Miller]

Hello,

Like the other 2 posters have already stated, you can create trunks with 10Mb (Ethernet) interfaces.

Now on the other hand, you cannot create etherchannels with anything less than 100Mb (Fast Ethernet) interfaces. I'm not sure if you are confusing the two technologies or not, but just thought I'd mention that.

http://www.cisco.com/en/US/tech/tk389/tk213/technologies_white_paper09186a0080092944.shtml

Regards,

Keith