Solved: Re: Inactive interfaces on module

dazza007 · ‎05-15-2019

Hi

Apologies I am, New to Cisco and new in my job looking at this switch I can see a number of ports that have no traffic. The switch is stacked.

I have always been confused what is going on here (I inherited it) I initially thought that it was something to do with the stack. Now I have had time to dig deeper, could the ports have lost their config in a power outage? So all I need to do is write the config for the ports?

sh module 2
Mod Ports Card Type Model Serial No.
---+-----+--------------------------------------+------------------+-----------
2 24 10GE (X2), 1000BaseX (SFP) WS-X4908-10GE JAE15180FZK

#show interfaces status module 2

Port Name Status Vlan Duplex Speed Type
Te2/1 ***INTERCORE CONNE connected trunk full 10G 10GBase-SR
Te2/2 ***INTERCORE CONNE connected trunk full 10G 10GBase-SR
Te2/3 ***TRUNK LINK*** connected trunk full 10G 10GBase-SR
Te2/4 ***TRUNK LINK*** connected trunk full 10G 10GBase-SR
Te2/5 ***TRUNK LINK*** connected trunk full 10G 10GBase-SR
Te2/6 ***TRUNK LINK*** notconnect 1 full 10G 10GBase-SR
Te2/7 ***iSCSI WM-SRV-WM connected 101 full 10G 10GBase-CU 3M
Te2/8 ***Public WM-SRV-W connected trunk full 10G 10GBase-CU 3M
Gi2/9 inactive 1 full 1000 No Gbic
Gi2/10 inactive 1 full 1000 No Gbic
Gi2/11 inactive 1 full 1000 No Gbic
Gi2/12 inactive 1 full 1000 No Gbic
Gi2/13 inactive 1 full 1000 No Gbic
Gi2/14 inactive 1 full 1000 No Gbic
Gi2/15 inactive 1 full 1000 No Gbic
Gi2/16 inactive 1 full 1000 No Gbic
Gi2/17 inactive 1 full 1000 No Gbic
Gi2/18 inactive 1 full 1000 No Gbic
Gi2/19 inactive 1 full 1000 No Gbic
Gi2/20 inactive 1 full 1000 No Gbic
Gi2/21 inactive 1 full 1000 No Gbic
Gi2/22 inactive 1 full 1000 No Gbic
Gi2/23 inactive 911 full 1000 No Gbic
Gi2/24 inactive 912 full 1000 No Gbic

GigabitEthernet2/9
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 0 0 0 0
Route cache 0 0 0 0
Hardware 0 0 0 0
Total 0 0 0 0
GigabitEthernet2/10
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 0 0 0 0
Route cache 0 0 0 0
Hardware 0 0 0 0
Total 0 0 0 0
GigabitEthernet2/11
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 0 0 0 0
Route cache 0 0 0 0
Hardware 0 0 0 0
Total 0 0 0 0
GigabitEthernet2/12
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 0 0 0 0
Route cache 0 0 0 0
Hardware 0 0 0 0
Total 0 0 0 0
GigabitEthernet2/13
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 0 0 0 0
Route cache 0 0 0 0
Hardware 0 0 0 0
Total 0 0 0 0

sh vlan

VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Te2/6, Gi2/9, Gi2/10, Gi2/11, Gi2/12, Gi2/13, Gi2/14
Gi2/15, Gi2/16, Gi2/17, Gi2/18, Gi2/19, Gi2/20, Gi2/21
Gi2/22
3 VLAN0003 active
5 VLAN0005 active

Giuseppe Larosa · ‎05-16-2019

Hello Dazza007,

no problem let's try to explain:

WM-MLS-DC1-001# sh hw-module module 2 port-group
Module Port-group Active Inactive
-------------------------------------------------------------
2 1 Te2/1-2 Gi2/9-12
2 2 Te2/3-4 Gi2/13-16
2 3 Te2/5-6 Gi2/17-20
2 4 Te2/7-8 Gi2/21-24

The explanation is the following:

if you use the Te2/1, Te2/2 ports in 10GE mode the corresponding GE ports Gi2/9-12 will not be used and showed as inactive.

You can notice there is an Active column and Inactive column (rightmost)

If you would change the mode for first port group to 1GE the inactive ports would become Te1/1-2 and will be listed on the rightmost column.

The same for all other groups.

Each single group either works in 10GE mode or in 1GE mode. (XOR ) not both at the same time.

the confusing aspect is that you will see unused ports in the list of interfaces, but once you are aware of this fact you can deal with it.

Hope to help

Giuseppe

View solution in original post

Jon Marshall · ‎05-15-2019

Is there anything connected to the ports ?

Jon

dazza007 · ‎05-16-2019

Hi Jon,

There are devices plugged , I am looking at the backup configs and there are no settings applied to that port from years ago.

The other ends of the connection are showing a connected port? I am very confused looking why this is setup like this.

Mark Malone · ‎05-16-2019

Hi i dont actually have one of these switches to check with but there looks to be a couple of points to check maybe in this post

https://community.cisco.com/t5/switching/4900m-with-2x-ws-x4908-10g-rj45-half-card-connecting-to-1gb/td-p/2047806

Giuseppe Larosa · ‎05-16-2019

Hello Mark,

yes it is what I remember for this kind of switch they can be configured to use 10GE or 1 Ge ports in group of ports.

The configuration sees all the possible ports even if not used (configured for tengiga only)

I agree that this fact can be misleading and can make confusion.

Thanks

Best Regards

Giuseppe

Giuseppe Larosa · ‎05-16-2019

Hello Dazza07,

from the output show we can see the following:

>> Gi2/9 inactive 1 full 1000 No Gbic ! <-------

From the point of view of the switch there is no SFP optic installed in the port is this true?

I have seen that you say that something is plugged in.

Another aspect what kind of device is this?

There is any chance that a group of ports are configured to work in 10GE mode and so these GE ports are actually only phantom ports?

Edit:

you have posted the sho module 2:

>> 2 24 10GE (X2), 1000BaseX (SFP) WS-X4908-10GE JAE15180FZK

I think the GE ports are not really existing you are using 8 tengiga ports. The module may be able to work in a different way.

Those GE ports are placeholders for when you change the configuration of the module to support GE ports instead of tengiga ports.

see the following links

https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-4900-series-switches/Prod_Bulletin_447737_Cat_4900M-Ex.html

is your device a C4900M swich ?

Hope to help

Giuseppe

dazza007 · ‎05-16-2019

I am very confused.

This is the output

WM-MLS-DC1-001# sh hw-module module 2 port-group
Module Port-group Active Inactive
-------------------------------------------------------------
2 1 Te2/1-2 Gi2/9-12
2 2 Te2/3-4 Gi2/13-16
2 3 Te2/5-6 Gi2/17-20
2 4 Te2/7-8 Gi2/21-24

So this module has virtual port groups?

Yes it is a 4900M :)

What I have is 2 stacked switches with 32 Twin SPF and 40 RJ45 ports.

I have Te1/1-8 and Te2/1-8 which are accounted for

I have gi2/10-24 which are down with no running config in them

I have Gi3/1-20 which are accounted for

Evidently I cannot understand fully the 40 RJ45 ports across the stack sorry from looking at the config.....

Giuseppe Larosa · ‎05-16-2019

Hello Dazza007,

no problem let's try to explain:

WM-MLS-DC1-001# sh hw-module module 2 port-group
Module Port-group Active Inactive
-------------------------------------------------------------
2 1 Te2/1-2 Gi2/9-12
2 2 Te2/3-4 Gi2/13-16
2 3 Te2/5-6 Gi2/17-20
2 4 Te2/7-8 Gi2/21-24

The explanation is the following:

if you use the Te2/1, Te2/2 ports in 10GE mode the corresponding GE ports Gi2/9-12 will not be used and showed as inactive.

You can notice there is an Active column and Inactive column (rightmost)

If you would change the mode for first port group to 1GE the inactive ports would become Te1/1-2 and will be listed on the rightmost column.

The same for all other groups.

Each single group either works in 10GE mode or in 1GE mode. (XOR ) not both at the same time.

the confusing aspect is that you will see unused ports in the list of interfaces, but once you are aware of this fact you can deal with it.

Hope to help

Giuseppe

Mark Malone · ‎05-16-2019

Yes that makes sense then with the converter command they speak of in the other post , interesting haven't seen that before , thanks

if you use the Te2/1, Te2/2 ports in 10GE mode the corresponding GE ports Gi2/9-12 will not be used and showed as inactive.

Previous post
The 8 fixed 10G ports will only operate at 10G and cannot be changed. However, you can use this half card to further install a TwinGig converter which converts a 10G port into two gig ports.