04-23-2015 04:38 AM
I have read several Brocade documents and I´m still searching for some ISL and Virtual channel (VC) best practice/guidance.
I have a 8510-8 switch with 2 ISL´s in a trunk.
I want to expand the trunk with 2 more ISL´s.
Index Slot Port Address Media Speed State Proto
16 2 0 50fbc0 id 16G Online FC E-Port 10:00:00:27:f8:30:6f:01 "ssw_1p02_vbas_a02" (downstream)(Trunk master)
17 2 1 50fb80 id 16G Online FC E-Port (Trunk port, master is Slot 2 Port 0 )
18 2 2 50fb40 -- N16 No_Module FC Disabled (Persistent)
19 2 3 50fb00 -- N16 No_Module FC Disabled (Persistent)
How do I balance the trunk using all avaiable VC´s (and buffer credits also)?
04-25-2015 10:02 AM
04-27-2015 06:00 AM
The VCs are per port and one of the reasons why the next link of the trunk is involved is lack of buffer credits on the first link. So in a normal trunk the traffic on one VC number is not balanced over the ISLs of the trunk. That's not necessary, anyway. There's also no balance between the VCs of a single ISL, because the decision which VC to use is bound to the destination ID. So I'd go with Alexey Stepanov's suggestion to create a second trunk to prevent the fabric from being split if the ASIC fails.