Solved: SFM Module assistance/port contention

shastymacnasty · ‎04-02-2008

I know this has been discussed in detail before but any advice would be much appreciated!

We have a 6509 with SUP2's an SFM2 and multiple WS-X6548-GE-TX's, I understand that this

card is oversubscribed to an 8:1 ratio, whereby if one port is pushing a gig then the

other 7 will have to fight for contention. My question is this: With the SFM2 module

increasing the backplane capacity to 256gigs is the ratio still 8:1 for the WS-X6548-GE-TX modules?

Or can each port theoretically supply 1 gig to each host at the same time continuously?

Regards

Jon Marshall · ‎04-02-2008

Hi

Without an SFM the 6548 will have to share the 32Gbps classic bus.

With an SFM it gets a dedicated 8Gbps connection to the switfch fabric. This means that there is still a lot of contention with this blade.

So in short with an SFM you still have a contended blade which is why Cisco recommend this as a wiring closet blade and not a server blade. Of course if you have clients that need a dedicated Gbp each then it's not much good in the wiring closet either.

Jon

View solution in original post

Jon Marshall · ‎04-02-2008

Hi

Without an SFM the 6548 will have to share the 32Gbps classic bus.

With an SFM it gets a dedicated 8Gbps connection to the switfch fabric. This means that there is still a lot of contention with this blade.

So in short with an SFM you still have a contended blade which is why Cisco recommend this as a wiring closet blade and not a server blade. Of course if you have clients that need a dedicated Gbp each then it's not much good in the wiring closet either.

Jon

shastymacnasty · ‎04-02-2008

Appreciate the quick response and help Jon, kinda knew that thats were we were heading..