In the 6500 platform, it's easily displayed with "show interface capabilities". Below is the sample output from the command. The portion we're interested in is labeled "Ports-in-ASIC".
6500-1#show interface capabilities module 2
GigabitEthernet2/1
Model: WS-X6724-SFP
Type: 1000BaseSX
Speed: 1000
Duplex: full
Trunk encap. type: 802.1Q,ISL
Trunk mode: on,off,desirable,nonegotiate
Channel: yes
Broadcast suppression: percentage(0-100)
Flowcontrol: rx-(off,on,desired),tx-(off,on,desired)
Membership: static
Fast Start: yes
QOS scheduling: rx-(1q8t), tx-(1p3q8t)
QOS queueing mode: rx-(cos), tx-(cos)
CoS rewrite: yes
ToS rewrite: yes
Inline power: no
Inline power policing: no
SPAN: source/destination
UDLD yes
Link Debounce: yes
Link Debounce Time: yes
Ports-in-ASIC (Sub-port ASIC) : 1-24 (1-12)
Remote switch uplink: no
Dot1x: no
Port-Security: yes
On the smaller platforms, the ASIC information is not included in the interface capabilities. Luckily, it's still obtainable, but from different commands.
On the 4500 platform, you'll use "show platform mapping ports interface":
4500-1#show platform mapping ports interface gigabitEthernet 3/1
Interface Gigaport Phyport Aggport PimPhyport
Gi3/1 23 185 1 0
You're interested in the Gigaport number. Unfortunately, I was unable to find a command to list this data for all of the ports on a card, so you'll have to re-issue it for all of the ports.
On the smaller catalyst platforms, like the 2960, 3560, 3750, and 3120X (HP Blade Frame Switches), you'll find it under "sh platform pm if-numbers":
3120X-1#sh platform pm if-numbers
interface gid gpn lpn port slot unit slun port-type lpn-idb gpn-idb
----------------------------------------------------------------------
Gi1/0/1 1 1 1 1/6 1 1 1 local Yes Yes
Gi1/0/2 2 2 2 1/8 1 2 2 local Yes Yes
Gi1/0/3 3 3 3 1/10 1 3 3 local Yes Yes
Gi1/0/4 4 4 4 1/12 1 4 4 local Yes Yes
Gi1/0/5 5 5 5 1/16 1 5 5 local Yes Yes
Gi1/0/6 6 6 6 1/18 1 6 6 local Yes Yes
Gi1/0/7 7 7 7 1/20 1 7 7 local Yes Yes
Gi1/0/8 8 8 8 1/22 1 8 8 local Yes Yes
Gi1/0/9 9 9 9 1/7 1 9 9 local Yes Yes
Gi1/0/10 10 10 10 1/9 1 10 10 local Yes Yes
Gi1/0/11 11 11 11 1/11 1 11 11 local Yes Yes
Gi1/0/12 12 12 12 1/13 1 12 12 local Yes Yes
Gi1/0/13 13 13 13 1/17 1 13 13 local Yes Yes
Gi1/0/14 14 14 14 1/19 1 14 14 local Yes Yes
Gi1/0/15 15 15 15 1/21 1 15 15 local Yes Yes
Gi1/0/16 16 16 16 1/23 1 16 16 local Yes Yes
Gi1/0/17 17 17 17 1/4 1 17 17 local Yes Yes
Gi1/0/18 18 18 18 1/15 1 18 18 local Yes Yes
Gi1/0/19 19 19 19 0/6 1 19 19 local Yes Yes
Gi1/0/20 20 20 20 0/7 1 20 20 local Yes Yes
Gi1/0/21 21 21 21 0/21 1 21 21 local Yes Yes
Gi1/0/22 22 22 22 0/20 1 22 22 local Yes Yes
Gi1/0/23 23 23 23 1/1 1 23 23 local Yes Yes
Gi1/0/24 24 24 24 1/0 1 24 24 local Yes Yes
Gi1/0/25 25 25 25 1/27 1 25 25 local Yes Yes
Gi1/0/26 26 26 26 1/26 1 26 26 local Yes Yes
Te1/0/1 27 27 27 0/0 1 1 27 local Yes Yes
Te1/0/2 28 28 28 0/14 1 2 28 local Yes Yes
St1 768 768 0 16/0 1 0 0 internal Yes Yes
Looking at Gi1/0/1, we're interested in the "port" column, it's 1/6. This means it's on ASIC #1 using port #6.
On CCO, I've been unable to find any good architecture documents, for the smaller switches, that list the ASIC layout. I figured this might be a good place to start a running list for the switches that I regularly deal with:
| Model | Port | ASIC |
| WS-C3750G-24TS | Gi 1/0/1 - 3 | 1 |
| Gi 1/0/5 - 8 | 2 | |
| Gi 1/0/9 - 12 | 0 | |
| Gi 1/0/13 - 16 | 3 | |
| Gi 1/0/17 - 20 | 6 | |
| Gi 1/0/21 - 22 | 4 | |
| Gi 1/0/23 - 24 | 5 | |
| Gi 1/0/25 - 26 | 4 | |
| Gi 1/0/27 - 28 | 5 | |
| WS-C3750E-48TD-S | Gi 1/0/1 - 24 | 1 |
| Gi 1/0/25 - 48 | 2 | |
| Gi 1/0/49 - 52 | 0 | |
| Te 1/0/1 - 2 | 0 | |
| WS-C3560-24PS-S | Fa 0/1 - 24 | 0 |
| Gi 0/1 - 2 | 0 | |
| WS-CBS3120X-S | Gi 1/0/1 - 18 | 1 |
| Gi 1/0/19 - 22 | 0 | |
| Gi 1/0/23 - 26 | 1 | |
| Te 1/0/1 - 2 | 0 | |
| WS-CBS3020-HPQ | Gi 0/1 - 2 | 4 |
| Gi 0/3 - 4 | 2 | |
| Gi 0/5 - 6 | 1 | |
| Gi 0/7 - 8 | 0 | |
| Gi 0/9 - 10 | 5 | |
| Gi 0/11 - 12 | 3 | |
| Gi 0/13 - 14 | 1 | |
| Gi 0/15 - 16 | 0 | |
| Gi 0/17 - 18 | 3 | |
| Gi 0/19 - 20 | 2 | |
| Gi 0/21 - 22 | 5 | |
| Gi 0/23 - 24 | 4 | |
| WS-C3560G-24TS | Gi 0/1 - 4 | 1 |
| Gi 0/5 - 8 | 0 | |
| Gi 0/9 - 12 | 3 | |
| Gi 0/13 - 16 | 2 | |
| Gi 0/17 - 20 | 6 | |
| Gi 0/21 - 24 | 5 | |
| Gi 0/25 - 28 | 4 | |
| WS-C3560E-12D-S | Gi 0/1 - 4 | 0 |
| Gi 0/5 - 8 | 1 | |
| Gi 0/9 - 12 | 2 | |
| Gi 0/13 - 16 | 3 | |
| Gi 0/17 - 20 | 4 | |
| Gi 0/21 - 24 | 5 | |
| Te 0/1 - 2 | 0 | |
| Te 0/3 - 4 | 1 | |
| Te 0/5 - 6 | 2 | |
| Te 0/7 - 8 | 3 | |
| Te 0/9 - 10 | 4 | |
| Te 0/11 - 12 | 5 | |
| WS-C2960-24TC-L | Fa 0/1 - 24 | 0 |
| Gi 0/1 - 2 | 0 |
[Added 9/12/2010]
The buffer allocations are not very well documented, and most of what I have is covered by NDA, but I did find one place that discusses it publicly:
http://www.cisco.com/en/US/docs/solutions/Enterprise/Video/tpqoscampus.html
Catalyst 3560G/3750G and 3650-E/3750E
[SNIP]
Additionally, these platforms provide (minimally) 750 KB of receive buffers and (up to) 2 MB of transmit buffers for each set of 4 ports. These buffers can be allocated, reserved, or dynamically borrowed from a common pool, on a port-port, per-queue basis, depending on the administrative configurations chosen.
Thanks for taking the time to write this excellent document. Helped me out!
ReplyDeleteThis article is fantastic! I'm forwarding a link to it to my whole networking team! Thank you!
ReplyDeleteNice !! Is there a command for a 3548 switch, specifically WS-3548-XL ? Thank You !!
ReplyDeleteThere might be, but I don't have access to the older XL platforms.
ReplyDeleteI searched a lot, but didn't find any :(
ReplyDeleteAlso 3548 does not take 'sh interface summary' command, to look for i/p and o/p queue drops.
I know this will end up sounding dense, but under the 4500 chassis, the Gigaport number was 23. Can you explain how to translate that to an Asic #?
ReplyDeleteWhat's important is which other ports share that ASIC (ie. they have the same Gigaport number), not necessarily whether it's ASIC #1, 2 or 3. Make sense?
DeleteWell done! Troubleshot an issue with ARP requests disappearing on a 2960G from 3 select servers. sh platform pm if-numbers helped me make it water tight.
ReplyDeleteBTW, linked here by http://www.gossamer-threads.com/lists/engine?do=post_view_flat;post=137016;page=1;sb=post_latest_reply;so=ASC;mh=25;list=cisco
-Charlie
For the 3500-XL family, see http://www.nasi.com/docs/pdfs/cisco3500xldatasheet.pdf. It looks like the 10/100 ports are attached to an octal Ethernet satellite.
ReplyDeleteGood work. 2014 and this is still relevant. It is a pity Cisco are so poor at providing information. We had to go through our top contacts to get snippets for a 3560x buffer allocation scheme, which looks inaccurate from lab tests we have performed.
ReplyDeleteThat is so true 2014 and still relevant. This helped me out. Thanks!
ReplyDeleteThanks, so helped me out .. :)
ReplyDeleteFor 4948, 4500:
ReplyDeleteSee Steve Fuller response
https://supportforums.cisco.com/discussion/11976051/3560x-asics-and-portchannel
command:
show platform chassis
or
show platform chassis | in Grandprix