4900M WS-X4908-10G-RJ45 Port Startup Delay

[shane_mann]

Hi all,

We have recently purchased 2 x 4900M switches with the following configuration:

2 x X2-10GB-SR installed in port te1/1, 1/2 (optical)

1 x 20 x 1GB RJ45 installed in the top left of chasis ge2/1 - 2/20

1 x WS-X4908-10G-RJ45 8 port 1/2 card in the top right of chassis te3/1 - 3/8

We have te1/1 connecting the 2 switches, and various vlan's and connections on the 1GB RJ45's with no problems.

However, we have a number of 10Gbps BaseT connections te3/1 - te3/5 which are causing us issues. On a reload of the switch or removal / re-install of the cable it can take anywhere up to an hour for the port to become active again. So when we reload the switch, we may get a connection come up after say 3 mins, but the port next to it may not come up for 15-60 min. The cabling is all the same (CAT6 and has been tested/verified) and all connections go to Broadcom 10Gb cards in Dell 820 servers running vmware. We have the following set on the ports:

switchport mode access

spanning-tree portfast

No speed or duplex can be set on these ports - these options are not available in the config.

Is this normal? Is there something I am missing in config for these ports? By the way, once a link is finally established, it will hold the link solid with no problems, but this is a problem for us, we can't have a reboot take an undetermined amount of time for the link to come back.

Any help appreciated.

Cheers,

Shane

[shane_mann]

Thanks for the additional info, I've had no updates from my support case yet.

The problem for us was the 4900M shipped new with 15.1 on it. So it didn't work for us straight out of the box, I had to request a downgrade to get the system running.

Cheers,

Shane

[Brian Shoemaker]

I just upgraded to 15.1.2 SG2 that was released in Sept 2013 and am having this same issue with upgrade from 12.2.54.  Took 2 of my ESX ports on the WS-X4908-10G-RJ45 a range of 11 min and 28 min to come up. 

I applied the commands to set the 10G to the ports, but on reboots it seemed to make little difference for delay coming up:

Conf t

hw-module module 2 port-group 1 select tengigabitethernet

hw-module module 2 port-group 2 select tengigabitethernet

hw-module module 2 port-group 3 select tengigabitethernet

hw-module module 2 port-group 4 select tengigabitethernet

exit

I watched the ports in "sh hw-module module 2 port-group" and they would bounce individual ports around from Active to Inactive:

4900M_1#sh hw-mod mod 2 port-group

Module Port-group Active                         Inactive

-------------------------------------------------------------

   2        1     Te2/1-2                        Gi2/9-10

   2        2     Te2/3                          Te2/4,Gi2/11-12

   2        3     Te2/5-6                        Gi2/13-14

   2        4     Te2/7-8                        Gi2/15-16

4900M_1#

4900M_1#sh hw-module module 2 port-group

Module Port-group Active                         Inactive

-------------------------------------------------------------

   2        1     Te2/1-2                        Gi2/9-10

   2        2     Te2/3-4                        Gi2/11-12

   2        3     Te2/5-6                        Gi2/13-14

   2        4     Te2/7-8                        Gi2/15-16

4900M_1#

===================

I hate to downgrade because of security issue of having an old IOS hanging around my environment... 

Anyone have any thoughts?

Thanks,

Brian

[shane_mann]

I worked with Cisco on this for some time. They have a fix for it and it is to be released in version  15.0(2) SG8.

I registered at the following link for notifications but haven't seen it released as yet. Apparently it is due for release by the end of the year.

http://www.cisco.com/cisco/support/notifications.html

Cheers,

Shane

[Iulian Vaideanu]

I see 15.0(2) SG8 is out already - can anybody test if it fixes the 10GBase-T port delay issue?

[Brian Shoemaker]

Thanks Shane for the quick update to my posting... 

I just noticed in the documentation for 15.0(2) SG8 IOS  that the "WS-X4908-10G-RJ45" is not on the supported hardware list, or mentioned anywhere in the documentation for Caveats Resolved or Open. 

http://www.cisco.com/en/US/docs/switches/lan/catalyst4500/release/note/OL_24728.html

Did I miss something?  Or is this card now not supported..?

Thanks,

Brian

[Brian Shoemaker]

https://tools.cisco.com/bugsearch/bug/CSCug68370

WS-X4908-10G-RJ45 and Broadcom 57810S 10Gb BASE-T interoperability issue

CSCug68370

Description

Symptom:
10Gbps BaseT ports (on WS-X4908-10G-RJ45) connected to Dell 820 servers with Broadcom 57810S DP 10Gb BASE-T. On a reload of the switch or removal / re-install of the cable ports are coming up after a long time (up to 1 hour) or not coming up at all.Conditions:
1) Module WS-X4908-10G-RJ45
2) Versions 15.0(2)SG through 15.0(2)SG7, 15.1(2)SG through 15.1(2)SG3Workaround:
Downgrade to 12.2(54)SG