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

Attention: The Cisco Support Community site will be in read only mode on Dec14, 2017 from 12:01am PST to 11:30am for standard maintenance. Sorry for the inconvenience.

New Member

10 Gb oversubscribed port for Dark Fiber ring

Hi, I understand that for an 8-port 10Gb module (6509) ports 1,2,5 & 6 are the only performance 10 Gb ports (true 20Gb at full duplex) Does this mean I will not get the 10Gb throughput for another port, I'm debating whether or not it is worth moving my 10Gb optical circuit (dark fiber) on a port #4 to a "performance" port such as 1,2,5 or 6. Thanks to all for your input.

1 ACCEPTED SOLUTION

Accepted Solutions
Hall of Fame Super Blue

Re: 10 Gb oversubscribed port for Dark Fiber ring

The 6708-10G card has 2 connections to the switch fabric

Fabric Channel #1: Ports 2, 3, 6, 8

Fabric Channel #2: Ports 1, 4, 5, 7

As far as i understand it that means that if you want 10Gbps on the port you can only use 2 ports from each fabric channel.

Cisco have provided a command to automatically shutdown ports 3,4,7,8 so that you are not oversubscribed on this module. But i don't think you have to use 1,2,5 & 6. You could use port 4 as long as you only used one other port from that fabric channel group ie. 1,5 or 7 and you would still get the full 10Gbps throughput.

Note i haven't actually tested the above but it is based on the way that all the 6500 fabric enabled modules work.

Jon

1 REPLY
Hall of Fame Super Blue

Re: 10 Gb oversubscribed port for Dark Fiber ring

The 6708-10G card has 2 connections to the switch fabric

Fabric Channel #1: Ports 2, 3, 6, 8

Fabric Channel #2: Ports 1, 4, 5, 7

As far as i understand it that means that if you want 10Gbps on the port you can only use 2 ports from each fabric channel.

Cisco have provided a command to automatically shutdown ports 3,4,7,8 so that you are not oversubscribed on this module. But i don't think you have to use 1,2,5 & 6. You could use port 4 as long as you only used one other port from that fabric channel group ie. 1,5 or 7 and you would still get the full 10Gbps throughput.

Note i haven't actually tested the above but it is based on the way that all the 6500 fabric enabled modules work.

Jon

328
Views
0
Helpful
1
Replies
CreatePlease to create content