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Internal switch modules creating two interfaces

I have a 2911 with an internal switch module(ES3G-16-P). When I install the switch module, the router is creating two seperate interfaces. I have worked with the these switch modules before on the 3845, but I've seen where two interfaces are created. Why are there two? Am I suppose to set up a port channel or can I use just one interface?

Dublin-Border-R1#sh ip int b

Interface                  IP-Address      OK? Method Status                Protocol

Embedded-Service-Engine0/0 unassigned      YES NVRAM  administratively down down

GigabitEthernet0/0         unassigned      YES NVRAM  administratively down down

GigabitEthernet0/1         unassigned      YES NVRAM  administratively down down

GigabitEthernet0/2         unassigned      YES NVRAM  administratively down down

GigabitEthernet1/0         10.1.1.1        YES manual up                    up 

GigabitEthernet1/1         unassigned      YES unset  up                    up 

Vlan1                      unassigned      YES unset  up                    up 

Dublin-Border-R1# sh cdp n

Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge

                  S - Switch, H - Host, I - IGMP, r - Repeater, P - Phone,

                  D - Remote, C - CVTA, M - Two-port Mac Relay

Device ID        Local Intrfce     Holdtme    Capability  Platform  Port ID

Dublin-Border-Sw1

                 Gig 1/0            171             S I   SM-ES3G-1 Gig 0/18

Dublin-Border-Sw1

                 Gig 1/1            171             S I   SM-ES3G-1 Gig 0/17

Dublin-Border-R1#

1 REPLY
VIP Super Bronze

Internal switch modules creating two interfaces

These are 2 redundant ports that connect the router to the switch internally.  You can use separately, but I have never seen them in portchannel. You may want to try it and see if it works.

HTH

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