Port son ASIC

Unanswered Question
Aug 29th, 2008

Hi all,

i did this command on switch

sh int fa 3/37 capabilities


Model: WS-X6148-RJ-21

Type: 10/100BaseTX

Speed: 10,100,auto

Duplex: half,full

Trunk encap. type: 802.1Q,ISL

Trunk mode: on,off,desirable,nonegotiate

Channel: yes

Broadcast suppression: percentage(0-100)

Flowcontrol: rx-(off,on),tx-(none)

Membership: static

Fast Start: yes

QOS scheduling: rx-(1q4t), tx-(2q2t)

CoS rewrite: yes

ToS rewrite: yes

Inline power: no

SPAN: source/destination

UDLD yes

Link Debounce: yes

Link Debounce Time: no

Ports on ASIC: 37-48

can anyone explain me what does this mean Ports on ASIC: 37-48 ??

Many thanks

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Replied by: mahesh18 - analyst, IBM - Aug 29, 2008, 11:28am PST

Also i want to know how much buffer sixe this port has?

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Replied by: mahesh18 - analyst, IBM - Aug 29, 2008, 11:39am PST

also i want to know what does this coomad


sh asic-version slot 3

Module in slot 3 has 2 type(s) of ASICs

ASIC Name Count Version

COIL 4 (2.0)

PINNACLE 1 (4.2)

I have this problem too.
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Giuseppe Larosa Fri, 08/29/2008 - 11:01

Hello Mahesh,

>> can anyone explain me what does this mean Ports on ASIC: 37-48 ??

this tells that ports 37-48 share an ASIC hardware resource on the switch (a chip with given features and performances)

this is often referred as port grouping here 12 ports are serviced by one ASIC because it is a linecard WS-X6148-RJ-21.

This is a C6500 modular switch.

>> sh asic-version slot 3

this command tells what types of ASICs are on the linecard.

if 12 ports for chip means 4 ASIC of each type.

These ASIC hardware also manage the connection to the switch bus that could be 8Gbps (4 Gbps + 4 Gbps)

There are several generations of linecards connecting to the system bus and/or using a 256 Gbps switching fabric and/or a 720 Gbps switching fabric (from this the name of SUP720)

so on 12 ports of the same group you can go up to what the ASIC can handle if it were 1 GBps you cannot have all 12 FE at full speed at the same time.

If it is more no problems.

This parameter is important on 48 GE linecard where the grouping tells what performance you can expect on ports.

sh int f3/37 should provide info on queues

Hope to help


mahesh18 Fri, 08/29/2008 - 11:06

Thanks for reply

but that module has 48 ports and sh asic slot 3 shows count 4 and 1 .

what does count 4 and 1 indicate?

total number of ports?

Giuseppe Larosa Fri, 08/29/2008 - 11:21

Hello Mahesh,

good observation: there are 4 COIL Asics managing 12 ports each and only one pinnacle that should be the ASIC that interface the linecars to the system bus.

for C6500 architecture

look on CCO I think you can find some explanations

using "C6500 internal architecture" to search


Hope to help


mahesh18 Fri, 08/29/2008 - 11:38


so Pinnacle is also Asic and my understanding is that ASIC is hardware chip on Line cards right?

Pinnacle is also hardware chip that connects

Linecard to system bus?

i have seen few switches where this is no Pinnacle when u do sh asic slot command whis it is liek that?so these switch how they connect to system bus then without pinnacle?

mahesh18 Fri, 08/29/2008 - 11:13


Also do u know any cisco book on switch 6500

architecture ?

Many thanks



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