Hello,
we have cisco switches 6500 in VSS mode, the sup we have is sup 720-10GB.
we run the 12.2(33)SXI6, I am working on QoS and I read in the following url :
http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/ios/12.2SX/configuration/guide/qos.html
which seems to be the right one about the QoS available on a 6500 in a LAN, that :
priority queuing and shaping is mutually exclusive.
is that really so ?
in fact that sentence is in the paragraph :
"Allocating Bandwidth Between Standard Transmit Queues"
and the exact text is :
"
...
Enter the shape keyword to configure SRR. Use of SRR prevents use of the strict priority queue.
To configure SRR, any CoS or DSCP values mapped to a strict-priority queue must be remapped to a standard queue
...
"
we have found that the Ethernet service plus board for 6500 support hierarchical QoS policies,
url :
http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/data_sheet_c78-643759.html
but it is a WAN board, and cisco Q & A link about 6500 & VSS :
http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps9336/prod_qas0900aecd806ed74b.html
states :
"WAN Modules : currently not supported"
So is there a possiblity (new version, hardware, etc. ?) in which priority queuing is possible along with shaping ?
The reason we need it is that the security equipment that is just after the 6500 VSS is not line rate, so we need to shape
at a bandwidth in which the security equipment won't drop packets at random and within the traffic there is TOIP and videoconferencing
needing a priority queue.
Hierarchical QoS policies would be ideal but it is still a dream and we would be pleased to shape individually every class except strict priority one,
to make sure the traffic remains below the dropping threshold of the security equipment.
