Questions on 3750 and cat6k

[sg_network]

Hi All,

I would like to ask about 3750 stacking and some Cat6 stuff...

1) How do we monitor 3750 stacking port in LMS?

2) Let say if I stack 3 switches, middle switch should be Master. Uplink should be at Top and Bottom. Is best practice?

3) Can we mixed 3750G and 3750X and what is result internal BW - fallback to 32Gps?

4) is there any Qos difference between WS-X6816-10G-2T and WS-X6816-10G-2TXL?

5) is there any Qos difference between MSFC5 PFC4 and MSFC5 PFC4XL?

6) What is main difference between PFC4 and PFC4XL in Sup2T?

7) Pls share more about Central and Distributed Switching in Sup2T and which card support Distributed DFCXL?

Thanks,

John

[Leo Laohoo]

6) What is main difference between PFC4 and PFC4XL in Sup2T?

The number of routes and netflow entries.  "XL" is what it means, extra large.

[Ian Jay]

4) is there any Qos difference between WS-X6816-10G-2T and WS-X6816-10G-2TXL?
5) is there any Qos difference between MSFC5 PFC4 and MSFC5 PFC4XL?
..
7) Pls share more about Central and Distributed Switching in Sup2T and which card support Distributed DFCXL?

4&5 The XL cards provide more Access List Entry (ACE) space with respect to QoS, however the throughput and queuing capability between those cards are the same

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/white_paper_c11-652042.html

7

For your knowledge, DFCs and PFCs are similar hardware and major versions (the number) must match. DFC4 and PFC4 are compatible.

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/white_paper_c11-676346.html

Check 6500 whitepaper lists for lots of good detail

http://www.cisco.com/en/US/products/hw/switches/ps708/prod_white_papers_list.html

[Joseph W. Doherty]

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Posting

2) Let say if I stack 3 switches, middle switch should be Master. Uplink should be at Top and Bottom. Is best practice?

As far as I know, beyond having uplinks on different switch members to avoid single point of failure, there's not a best practice for which switch is stack master or which stack members host the uplinks.  Common practice probably is to use top and bottom stack members for uplinks.  In theory, might be some tiny benefit to having stack member on least busy stack member (such a stack member not hosting uplinks) but the bulk of traffic forwarding should be at the hardware level.  If you have software traffic forwarding you likely have a bigger problem than will be addressed by which stack is the stack master.

3) Can we mixed 3750G and 3750X and what is result internal BW - fallback to 32Gps?

Yes and yes.  Stack also falls back to Stackwise from Stackwise+, which might be just as bad a loss as losing half your stack ring bandwidth.  (Mixed stack is also more difficult to IOS upgrade.)