I am trying to understand how line-rate works on catalyst switches. Lets assume I have a WS-2960G-48 model switch. The advertised backplane capacity for this platform is 32G. That is 32Gbps for 48 ports, so I assume straightaway that its a blocking (as in not-non-blocking) switch
sw1#sh platform pm if-numbers interface gid gpn lpn port slot unit slun port-type lpn-idb gpn-idb ---------------------------------------------------------------------- Gi0/1 1 1 1 5/3 1 1 1 local Yes Yes Gi0/2 2 2 2 5/0 1 2 2 local Yes Yes Gi0/3 3 3 3 5/1 1 3 3 local Yes Yes Gi0/4 4 4 4 5/2 1 4 4 local Yes Yes Gi0/5 5 5 5 4/2 1 5 5 local Yes Yes Gi0/6 6 6 6 4/3 1 6 6 local Yes Yes Gi0/7 7 7 7 4/0 1 7 7 local Yes Yes Gi0/8 8 8 8 4/1 1 8 8 local Yes Yes Gi0/9 9 9 9 7/3 1 9 9 local Yes Yes Gi0/10 10 10 10 7/0 1 10 10 local Yes Yes Gi0/11 11 11 11 7/1 1 11 11 local Yes Yes Gi0/12 12 12 12 7/2 1 12 12 local Yes Yes Gi0/13 13 13 13 6/2 1 13 13 local Yes Yes Gi0/14 14 14 14 6/3 1 14 14 local Yes Yes Gi0/15 15 15 15 6/0 1 15 15 local Yes Yes Gi0/16 16 16 16 6/1 1 16 16 local Yes Yes Gi0/17 17 17 17 3/3 1 17 17 local Yes Yes Gi0/18 18 18 18 3/0 1 18 18 local Yes Yes Gi0/19 19 19 19 3/1 1 19 19 local Yes Yes Gi0/20 20 20 20 3/2 1 20 20 local Yes Yes Gi0/21 21 21 21 2/2 1 21 21 local Yes Yes Gi0/22 22 22 22 2/3 1 22 22 local Yes Yes Gi0/23 23 23 23 2/0 1 23 23 local Yes Yes Gi0/24 24 24 24 2/1 1 24 24 local Yes Yes Gi0/25 25 25 25 9/3 1 25 25 local Yes Yes Gi0/26 26 26 26 9/0 1 26 26 local Yes Yes Gi0/27 27 27 27 9/1 1 27 27 local Yes Yes Gi0/28 28 28 28 9/2 1 28 28 local Yes Yes Gi0/29 29 29 29 8/2 1 29 29 local Yes Yes Gi0/30 30 30 30 8/3 1 30 30 local Yes Yes Gi0/31 31 31 31 8/0 1 31 31 local Yes Yes Gi0/32 32 32 32 8/1 1 32 32 local Yes Yes Gi0/33 33 33 33 1/3 1 33 33 local Yes Yes Gi0/34 34 34 34 1/0 1 34 34 local Yes Yes Gi0/35 35 35 35 1/1 1 35 35 local Yes Yes Gi0/36 36 36 36 1/2 1 36 36 local Yes Yes Gi0/37 37 37 37 0/2 1 37 37 local Yes Yes Gi0/38 38 38 38 0/3 1 38 38 local Yes Yes Gi0/39 39 39 39 0/0 1 39 39 local Yes Yes Gi0/40 40 40 40 0/1 1 40 40 local Yes Yes Gi0/41 41 41 41 11/3 1 41 41 local Yes Yes Gi0/42 42 42 42 11/0 1 42 42 local Yes Yes Gi0/43 43 43 43 11/1 1 43 43 local Yes Yes Gi0/44 44 44 44 11/2 1 44 44 local Yes Yes Gi0/45 45 45 45 10/3 1 45 45 local Yes Yes Gi0/46 46 46 46 10/2 1 46 46 local Yes Yes Gi0/47 47 47 47 10/1 1 47 47 local Yes Yes Gi0/48 48 48 48 10/0 1 48 48 local Yes Yes I presume from the above outputs that are 12 asics of 4 ports each. 1) Does traffic within the ASIC hit the backplane and count towards the backplane 32 gbps capacity? Does say traffic from port Gi0/29 to Gi0/30 (both in Asic 8) reach the backplane or simply switched locally at ASIC level? 2) If the answer to the above is yes, and assuming all ports are transmitting at the same time at 1 Gbps, then presumably we can call this a line-rate switch provided the right connections are in the right places? if the answer is no, and assuming all ports are transmitting at the same time at 1 Gbps, then there will be about ~16 gbps worth of drops? Thanks, Shan _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
