Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

Traffic Traversing VSL

We just bought some new toys,  2 x 6506 with VSS sups

they are connected by 2 x 10gig links

I keep reading in the documentation that traffic should never traverse the VSL links , because you use etherchannels everywhere,  but what if you have devices where etherchannel is not possible etc , why is it a problem traversing the VSS links when we need to? the sups are using very little of the 20 gigs

I am designing my network so that vss link doesnt get used , i just need to know there wont be a problem if there is a few that need it.

do i need to make extra etherchannel between the 2 switches for these leaks? ( the sup has 2 x sfp gig-e spare)

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Blue

Re: Traffic Traversing VSL

ukglobecast wrote:

Thanks very much John for confirming

I will put any single homed things to go via etherchanneled switches.

Could i pick your brain on something else ---I have 2 ASA5540s on active/standby , what is the best way to implement this in a VSS environment  Just one on each vss switch ? the firewalls are currently  dot1q trunks.

Rob

Never deployed it but i would recommned connecting one ASA to one of the chassis and the other ASA to the other chassis simply because if there is a chassis failure you would still have a firewall up and running.

Jon

3 REPLIES
Hall of Fame Super Blue

Re: Traffic Traversing VSL

ukglobecast wrote:

We just bought some new toys,  2 x 6506 with VSS sups

they are connected by 2 x 10gig links

I keep reading in the documentation that traffic should never traverse the VSL links , because you use etherchannels everywhere,  but what if you have devices where etherchannel is not possible etc , why is it a problem traversing the VSS links when we need to? the sups are using very little of the 20 gigs

I am designing my network so that vss link doesnt get used , i just need to know there wont be a problem if there is a few that need it.

do i need to make extra etherchannel between the 2 switches for these leaks? ( the sup has 2 x sfp gig-e spare)

Rob

The VSL will pass data traffic as well as VSL control packets so you don't need a separate etherchannel but as you say you should do your utmost to avoid having to use the VSL  for data traffic.

To be honest you shouldn't really be connecting any singly honed devices into the VSS pair anyway. If you have servers that only have on NIC you would be better off having these on a separate switch and then running an etherchannel from that switch across the VSS pair.

Jon

Re: Traffic Traversing VSL

Thanks very much John for confirming

I will put any single homed things to go via etherchanneled switches.

Could i pick your brain on something else ---I have 2 ASA5540s on active/standby , what is the best way to implement this in a VSS environment  Just one on each vss switch ? the firewalls are currently  dot1q trunks.

Hall of Fame Super Blue

Re: Traffic Traversing VSL

ukglobecast wrote:

Thanks very much John for confirming

I will put any single homed things to go via etherchanneled switches.

Could i pick your brain on something else ---I have 2 ASA5540s on active/standby , what is the best way to implement this in a VSS environment  Just one on each vss switch ? the firewalls are currently  dot1q trunks.

Rob

Never deployed it but i would recommned connecting one ASA to one of the chassis and the other ASA to the other chassis simply because if there is a chassis failure you would still have a firewall up and running.

Jon

245
Views
5
Helpful
3
Replies