Solved: ASIC on 3560/3750

dvanzee · ‎12-19-2008

Does anyone have a document that shows the ASIC mappings on these two switches. I am looking for something that will show port 1-5 in on the first asic and 6-10 and the second etc. Ideas?

Edison Ortiz · ‎12-19-2008

ASIC stands for Application-Specific Integrated Circuit. On a switch, there are many ASICs - you can have an ASIC dedicated for NetFlow, ACLs, among other services.

The more ASICs you have in a switch, the less you use the CPU for those services hence making the switch a lot faster.

In the 6500/4500, the ports are group due to the oversubscription nature and they are physically connected to an ASIC. This hardware controls traffic to/from the port or group of ports.

HTH,

__

Edison.

View solution in original post

Giuseppe Larosa · ‎12-19-2008

Hello Daniel,

I didn't find ASICs mappings only the declared performance data for C3750

see table 2

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps5023/product_data_sheet0900aecd80371991.html

Hope to help

Giuseppe

Edison Ortiz · ‎12-19-2008

The port-grouping is done in modular switches such as 4500 and 6500 due to the limited backplane capability.

3560/3750 perform wire rate switching and do not implement any kind of port-grouping.

HTH,

__

Edison.

dvanzee · ‎12-19-2008

so when you say wire rate. If I have a 48 port 3750 E all running gig (48 gig) and I have 4 trunk ports running 10 gig (40 gig) is that still wire rate? where does the remaining 8 gig come from? I am trying to understand what wire rate really means.

dvanzee · ‎12-19-2008

Can someone tell me what an asic is as it relates to the switch ports on a switch?

Edison Ortiz · ‎12-19-2008

ASIC stands for Application-Specific Integrated Circuit. On a switch, there are many ASICs - you can have an ASIC dedicated for NetFlow, ACLs, among other services.

The more ASICs you have in a switch, the less you use the CPU for those services hence making the switch a lot faster.

In the 6500/4500, the ports are group due to the oversubscription nature and they are physically connected to an ASIC. This hardware controls traffic to/from the port or group of ports.

HTH,

__

Edison.

Edison Ortiz · ‎12-19-2008

Yes, all that information is contained in the data sheet provided in the post above mine.

Wire rate means speed that equals to the speed of the port, there isn't any oversubscription like in the 6500 and 4500 switches.

Joseph W. Doherty · ‎12-19-2008

I haven't seen that documented.

For the later 3750-E, there's: http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps5023/prod_presentation09186a0080161372.pdf. I would think the non-E architecture might be somewhat similar.

Since original StackWise ports are 8 Gbps and the 10 gig port on the 3750G-16TD only could sustain 8 Gbps, and the fabric is noted as 32 Gbps, I think there's a chance port ASICs in the 3560/3750 support 8 Gbps.

Joseph W. Doherty · ‎12-23-2008

Addendum:

Just came across the "sh platform pm if-numbers", which in column "port" might note the ASIC port as the first value.

nelcnetworks · ‎02-07-2013

Guys,

Dont know if this is of any use but the commend on a 3560 - sh platform pm platform-block gives the following

A04S05-3560-20#sh platform pm platform-block

interface gid gpn lpn asic hw-i flags sp dp bundle vlan mvid mac so_di i_vlan
-----------------------------------------------------------------------------
Fa0/1     3   3   1   1    2       U 2 2 no     0    0    0   61443 0
Fa0/2     4   4   2   1    3       U 1 2 no     0    0    0   61444 0
Fa0/3     5   5   3   1    4       U 2 2 no     0    0    0   61445 0
Fa0/4     6   6   4   1    5       D 2 2 no     0    0    0   61446 0
Fa0/5     7   7   5   1    6       D 2 2 no     0    0    0   61447 0
Fa0/6     8   8   6   1    7       U 1 1 no     0    0    0   61448 0
Fa0/7     9   9   7   1    8       U 2 2 no     0    0    0   61449 0
Fa0/8     10 10 8   1    9       U 2 2 no     0    0    0   61450 0
Fa0/9     11 11 9   1    10      U 2 2 no     0    0    0   61451 0
Fa0/10    12 12 10 1    11      U 2 2 no     0    0    0   61452 0
Fa0/11    13 13 11 1    12      U 2 2 no     0    0    0   61453 0
Fa0/12    14 14 12 1    13      U 2 2 no     0    0    0   61454 0
Fa0/13    15 15 13 1    14      U 2 2 no     0    0    0   61455 0
Fa0/14    16 16 14 1    15      U 2 2 no     0    0    0   61456 0
Fa0/15    17 17 15 1    16      U 2 2 no     0    0    0   61457 0
Fa0/16    18 18 16 1    17      U 2 2 no     0    0    0   61458 0
Fa0/17    19 19 17 1    18      U 2 2 no     0    0    0   61459 0
Fa0/18    20 20 18 1    19      U 2 2 no     0    0    0   61460 0
Fa0/19    21 21 19 1    20      U 2 2 no     0    0    0   61461 0
Fa0/20    22 22 20 1    21      U 2 2 no     0    0    0   61462 0
Fa0/21    23 23 21 1    22      D 1 2 no     0    0    0   61463 0
Fa0/22    24 24 22 1    23      U 1 1 no     0    0    0   61464 0
Fa0/23    25 25 23 1    24      U 2 2 no     0    0    0   61465 0
Fa0/24    26 26 24 1    25      U 2 2 no     0    0    0   61466 0
Fa0/25    29 29 25 0    2       U 2 2 no     0    0    0   61469 0
Fa0/26    30 30 26 0    3       U 2 2 no     0    0    0   61470 0
Fa0/27    31 31 27 0    4       U 2 2 no     0    0    0   61471 0
Fa0/28    32 32 28 0    5       U 1 2 no     0    0    0   61472 0
Fa0/29    33 33 29 0    6       U 2 2 no     0    0    0   61473 0
Fa0/30    34 34 30 0    7       U 2 2 no     0    0    0   61474 0
Fa0/31    35 35 31 0    8       U 2 2 no     0    0    0   61475 0
Fa0/32    36 36 32 0    9       U 2 2 no     0    0    0   61476 0
Fa0/33    37 37 33 0    10      D 0 0 no     0    0    0   61477 0
Fa0/34    38 38 34 0    11      U 2 2 no     0    0    0   61478 0
Fa0/35    39 39 35 0    12      D 0 0 no     0    0    0   61479 0
Fa0/36    40 40 36 0    13      U 2 2 no     0    0    0   61480 0
Fa0/37    41 41 37 0    14      D 1 2 no     0    0    0   61481 0
Fa0/38    42 42 38 0    15      U 2 2 no     0    0    0   61482 0
Fa0/39    43 43 39 0    16      D 1 2 no     0    0    0   61483 0
Fa0/40    44 44 40 0    17      U 2 2 no     0    0    0   61484 0
Fa0/41    45 45 41 0    18      U 2 2 no     0    0    0   61485 0
Fa0/42    46 46 42 0    19      U 2 2 no     0    0    0   61486 0
Fa0/43    47 47 43 0    20      U 2 2 no     0    0    0   61487 0
Fa0/44    48 48 44 0    21      D 0 0 no     0    0    0   61488 0
Fa0/45    49 49 45 0    22      U 2 2 no     0    0    0   61489 0
Fa0/46    50 50 46 0    23      D 0 0 no     0    0    0   61490 0
Fa0/47    51 51 47 0    24      U 2 2 no     0    0    0   61491 0
Fa0/48    52 52 48 0    25      U 2 2 no     0    0    0   61492 0
Gi0/1     1   56 49 1    0       U 3 2 no     0    0    0   61496 0
Gi0/2     2   57 50 1    1       U 3 2 no     0    0    0   61497 0
Gi0/3     27 27 51 0    1       D 0 0 no     0    0    0   61467 0
Gi0/4     28 28 52 0    0       D 0 0 no     0    0    0   61468 0
Po1       56 56 0   0    0       U 0 0 no     0    0    0   61496 0
A04S05-3560-20#

which appears to show two asics, each controlling 26 ports (24 Fa and 2 Gi) (Po may be even distributed between asics)

hope it helps.