Interface numbering with the module module WS-X6904-40G Cisco Catalyst 6900 Series 40 Gigabit Ethernet .

Usually the interface numbering for Cisco equipment is pretty strait forward.
It is interface Type chassis/Slot/port number or Type switch/module/port number  I.e. interface Gi1/0/1 will refer to port 1 of a catalyst 2960s or cat3750, in the case of a Catalyst 6500, interface Gi1/1/1 to port 1 of the module/blade 1 in the chassis #1 of a VSS pair.
So if you see the following interface TE1/2/8 you would assume that it’s the 8 interface on slot 2 for the chassis #1 and you might be wrong  If you are using the module WS-X6904-40G Cisco Catalyst 6900 Series 40 Gigabit Ethernet Interface Module with the port adapter CVR-CFP-4SFP10G FourX converter to convert each 40GE port into 4 10GE SFP+ ports.
The numbering for this module is as follows, port 1 to 4 refer to 40G port and port 5-20 to the 10G port.

So if you have the following setup

blog

The interface numbering for your interface in the configuration would be

show interfaces status switch 1 module 2

Port       Name   Status                   Vlan                       Duplex                 Speed   Type
Te1/2/5               connected          trunk                     full         10G        10Gbase-LR
Te1/2/6               connected          trunk                     full         10G        10Gbase-SR
Te1/2/7               connected          trunk                     full         10G        10Gbase-SR
Te1/2/8               disabled              unassigned        full         10G        10Gbase-SR
Te1/2/9               disabled              routed                 full         10G        No Connector
Te1/2/10             disabled              routed                 full         10G        No Connector
Te1/2/11             disabled              routed                 full         10G        No Connector
Te1/2/12             disabled              routed                 full         10G        No Connector
Te1/2/13             connected          trunk                     full         10G        10Gbase-SR
Te1/2/14             connected          trunk                     full         10G        10Gbase-SR
Te1/2/15             connected          trunk                     full         10G        10Gbase-SR
Te1/2/16             connected          trunk                    full         10G        10Gbase-SR
Te1/2/17             disabled              routed                 full         10G        No Connector
Te1/2/18             disabled              routed                 full         10G        No Connector
Te1/2/19             disabled              routed                 full         10G        No Connector
Te1/2/20             disabled              routed                 full         10G        No Connector

It is important to remember this, when instructing an onsite technician where to plug or unplug cable as unless he knows the particular numbering there is a good chance that he will count the port from right to left starting at 1 and when you specified port te1/2/5 that correspond to the first 10G port on the blade, he might unplug port te1/2/9 (5th physical port) and create havoc in your network.

I almost learn this particularity the hardway and though I might not be the only one

About Mario

Consultant en télécommunication et CCIE #7704 depuis plus de 15 ans et totalisant plus de 30 ans d'expérience en TI. Ce blog sera un reflet de mes opinions sur les nouvelles technologies et l'impact de ces dernières sur nos vies Network consultant and CCIE #7704 for more than 15 year with over 30 years in IT, This blog will be my take on technology and the impact on our life suivez moi / Follow me on Twitter , Google Plus , Linkedin
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