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Community Member

interface gi 0/25 on a SM-ES3G-24-P


I just receive a new Cisco 3925 with a etherswitch module 24 port :  SM-ES3G-24-P

I successfully boot the switch module and gain access to it.

I found some documentation on CCO but I don't sorted out this small information :

Switch#sh cdp neig
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
Router           Gig 0/26          143             R S I  CISCO3925 Gig 2/0

The Router is connected to the switch module via a HIMI :

The Cisco enhanced EtherSwitch service modules also provide a physical Gigabit  Ethernet serializer/deserializer integrated circuit transceiver (HIMI)  interface. In the Cisco 2900 series and Cisco 3900 series routers, the HIMI link  on the Cisco enhanced EtherSwitch service modules is connected to the router  internal Gigabit Ethernet backplane. This link is used for interconnection  between other interface cards or network modules attached to the router Gigabit  Ethernet backplane bypassing the router host CPU; thus, increasing CPU  performance by decreasing CPU processing.

If I do a sh ip int brief on the switch, I have 26 interface but only 24 are physicaly present on the front.

The type of the 0/25 and 0/26 are the same : media type is 1000BaseX

The interface gi 0/26 is up up but the 0/25 is down down.

What's the goal of this gi 0/25 interface ?

this is use to connect via the backplane (MGF ???) 2 switching module ? ???

Thanks for help me to clarify.

Steve Balon

Community Member

Re: interface gi 0/25 on a SM-ES3G-24-P

Any update ??

Can someone help me ??

Thanks in advance.


Community Member

interface gi 0/25 on a SM-ES3G-24-P

Did you find out what gi0/25 and gi0/26 do?

Community Member

interface gi 0/25 on a SM-ES3G-24-P


Unfortunatly not..

I leave this interface unused.



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