VSS on 6509/SUP2T - big problems getting it to work

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May 25th, 2012
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Hi there,

I've got big problems setting up a VSS with 2 6509-E with ONE sup2T in each 6509.

I started configuring the 2 SUPs like this:


VSS config in general is not very complex.

VSL is up (2x10Gig channel from the 2 sup-ports to the 2 sup-ports)

I connected 2 4509E with sup7e with 2 links (1 to sup2t-switch1 and one to sup2t-switch2)

I used port 1 and 3 at the sup7e (i also tried other ones... 1 port on sup7e on on 4712-card... 2 on 4712 card...)

configured PagP on both sides. I had also a look to


I started with 15.0-1 SY1 advipservices - and had problems with the PagP channels.

only the port to the active sup2T is aggregated to the channel - the second

port toggled between stand-alone and waiting to be aggregated.

I tested a lot of things.. changed ports.. cables.. SFP+'s.. X2's... rebooted.. powercycled...

than I installed 12.2.50 SY1 and everything seems to be working... at first....

I did some test - played around with some failure-scenarios - and channels broke up again.

at the moment I'm NOT able to get the channels working..

Than I configured an IPaddress in vlan 1.

the 2 4500s also have management IP in vlan1.

I was NOT able to ping the VSS..

i did a "redundancy force-switchover" and - voila - ping is working.. (I did a lot of pinging - not only one...)

switching back to switch 1 - ping keeps working....

is there anybody out there who can help me?

Is VSS on sup2t so buggy that it is not usable? I can't believe that.. ok. it's just ED..

pleeease help...

many thanks in advance



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Reza Sharifi Fri, 05/25/2012 - 07:52
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Hi Christian,

Can you post a quick diagram of your network showing the physical links interconnects and the Portchannels you are using?

Christian Bauer Fri, 05/25/2012 - 08:13
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quick and dirty ;-)

4500s uses ports on SUP

6500 uses ports on linecard 6908

VSL via ports on SUP2t

Reza Sharifi Fri, 05/25/2012 - 08:44
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What test are you performing? Are the hosts connected to the 4500 switches and pinging 6500?

Are you using ePAGP for dual-active detection of fast hello?

Christian Bauer Sat, 05/26/2012 - 01:10
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Just pinging from 4500 to 6500. Both VLAN1. L2-Trunks between 45 and 65.

I'm using ePAgP. ePAgP is supported on 4500 (XE 3.3.0)

Christian Bauer Fri, 05/25/2012 - 08:24
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Hello Sajid,

I tired a lot of things.. this is the current layout.

please see my other posting - I tried a lot of combinations of ports.

I changed nearly everything - SFPs/X2s/Cables/......

Christian Bauer Fri, 05/25/2012 - 08:26
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SUP7e is able to handle all 4 Ports non-blocking in single SUP mode...

only while using redundancy you can only use port 1 and 2.

sajid_m123 Fri, 05/25/2012 - 08:11
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Please post the diagram . Meanwhile, make sure you are following the link below:


Limitation and Restrictions on Supervisor Engine 7-E:

Please note the following:

When you use WS-X45-SUP7-E in RPR or SSO mode, only the first two uplinks on each supervisor engine are available. The second two uplinks are unavailable.

Christian Bauer Fri, 05/25/2012 - 08:23
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SUP-7E is standalone - one SUP in one Chassis - no redundancy.

I also tried channeling one SUP port (5/1) and one port from 4712-linecard.

next try was both ports on 4712.

always the same.

I also took an 2960 and linked it up to one gigE port on each SUP2T with PagP - same problem..

link to standby-sup is always crazy.

at the moment I can't ping the VLAN1 IP of VSS-system (all switches have a management IP in VLAN1 (/24-network))

If I do a "redundancy force-switchover" the connectivity is immediatly established.. and VLAN1 of VSS is pingable.

Very strange. what hardware tests can I do to be sure that the SUPs are working well?

I also tested links with UDLD. the links to the passive chassis ALWAYS run into err-disabled.

(udld enable - not udld aggressive)

Christian Bauer Sat, 05/26/2012 - 01:06
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of course - but unfortunately not before tuesday. Monday is a public holiday in Germany and I'm not in the office at the weekend.

sajid_m123 Sat, 05/26/2012 - 07:42
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what is the o/p for the following;

sh switch virtual

sh switch virtual role

remote command standby-rp show switch virtual role

sh switch virtual redundancy

sh switch virtual link detail

Christian Bauer Tue, 05/29/2012 - 13:57
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Hi sajid,

I think the config and VSS setup should be ok. Since today one of the 2 SUPs seems to be completly broken.

The system won't come up and crashes during minimal bootup-GOLD-Test.

I checked the plain SUP without any modules. Flash is ok. Chassis is ok.

Unfortunately SmartNet is still in progress - but I think it will be ready tomorrow and I will open a TAC Case.

I will keep you informed how things are going on.

Many thanks for your help so far,


Christian Bauer Tue, 06/05/2012 - 01:51
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Hello @ll,

I got a new SUP2T on Thursday - and voila... everything is working fine now.

But anyway - thanks for your help and troubleshooting.




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