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New Contributor
Posts: 4
Registered: ‎01-13-2011

8Gb switches and the vc channels

ScreenHunter_01 Mar. 19 11.20.gifHi

Hello,

How to find out the mapping between the fysical switchports and his VC channel? 

I have B5300 switches and would like to move the storage port to different VC channels for bottleneck issue's

It soons like : port 0 16 32 48  64 mapped to vc0

                      port 1 17 33 49  65  mapped to vc1

                      port 2 18 34 50  66  mapped to vc2

                    ...........................

                      port 15 31 47 63 79  mapped to vc16

Regards

Ivo

Regular Contributor
Posts: 164
Registered: ‎05-11-2011

Re: 8Gb switches and the vc channels

Hi Ivo,

you can not use all 16 VC Channels.

VC 0: for Class F traffic only

VC 1: Reserved

VC 2-5: for Medium Priority QoS traffic

VC 6: Class 3 multicast

VC 7: Broadcast/Multicast

VC 8+9: Low Priority QoS

VC 10-14: High Priority QoS

VC 15: Reserved

If you do not use QoS Based Traffic Prioritization you will use only VC 2 - 5 for your traffic.

Then you have only the following VC available:

VC 0: Class F traffic

VC 1: Class 2 Ack/Link Control

VC 2-5: Data Frames

VC 6: Class 3 multicast

VC 7: Broadcast / Multicast

It depends on the Destination Port which VC is used.

Ports with with binary value 0000 will use VC 2, with binary value 0001 will use VC 3, with binary value 0010 will use VC 4

and ports with binary value 0011 will use VC 5.

Regards

Ralf

Kind Regards
Ralf
New Contributor
Posts: 4
Registered: ‎01-13-2011

Re: 8Gb switches and the vc channels

Thanks Ralf ,

can you evaluate the vc for this litte output,

the explanation "port with bin 0000 use vc2 , dec 0001 use vc3 , dec 0010 use vc4 and dec 0011 use vc5" is not clear to me.

this means: port 0 use vc ....                    this is a dest port storage.

                    port 1 use vc ....

                    port 2 use vc ....

                    port 8 use vc ....                    this is also a dest storage

Regards

Ivo

ScreenHunter_03 Mar. 19 16.43.gifScreenHunter_02 Mar. 19 16.35.gif

Regular Contributor
Posts: 164
Registered: ‎05-11-2011

Re: 8Gb switches and the vc channels

Hi Ivo,

sorry there was a mistake in my explanation. I correct it right now.

Dest. Port 0 has binary value 0000 so it uses VC 2

Dest. Port 1 has binary value 0001 so it uses VC 3

Dest. Port 2 has binary value 0010 so it uses VC 4

Dest. Port 3 has binary value 0011 so it uses VC 5

Dest. Port 4 has binary value 0100 so it uses VC 2

Dest. Port 5 has binary value 0101 so it uses VC 3

Dest. Port 6 has binary value 0110 so it uses VC 4

Dest. Port 7 has binary value 0111 so it uses VC 5

Dest. Port 8 has binary value 1000 so it uses VC 2

Dest. Port 9 has binary value 1001 so it uses VC 3

and so on...

Sorry for the problem in my first explanation.

Regards Ralf

Kind Regards
Ralf

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