[c-nsp] 3750 Dropping into software forwarding?
Siva Valliappan
svalliap at cisco.com
Thu Feb 1 03:29:48 EST 2007
it sounds like you exceeded the TCAM resources on the C3750 forcing it
to fallback to software forwarding. you might want to take a look at
how many ACLs, routes, VLANs, multicast groups, etc you have and
try pruning back on one or the other to get back under the TCAM
limit on the 3750.
cheers
.siva
On Wed, 31 Jan 2007, Peter Kranz wrote:
> Had one of our customer's 3750's jump in CPU utilization from its normal 18%
> or so to 80%, and the amount of traffic it would forward drop to around 100
> Mb/s via one of its BGP peers. I tried dropping a few routes from the peer
> and suddenly CPU utilization dropped back to 18% and all's well. This box
> has about ~3500 routes on it. No errors showed up in the logs. Running Cisco
> IOS Software, C3750 Software (C3750-I5-M), Version 12.2(25)SEA, RELEASE
> SOFTWARE (fc)
>
> I noticed this in the CEF memory, and I'm guessing I've hit a memory limit
> in CEF causing it to dump back into software forwarding. Will another SDM
> profile help this situation, I'm currently in "desktop default".
>
> sho cef memory
> Memory in use/allocated Count
> ------------------------------------------------------------------
> ADJ: DROP adjacency : 344/400 ( 86%) [1]
> ADJ: Discard adjacency : 344/400 ( 86%) [1]
> ADJ: Glean adjacency : 344/400 ( 86%) [1]
> ADJ: NULL adjacency : 344/400 ( 86%) [1]
> ADJ: PUNT adjacency : 344/400 ( 86%) [1]
> ADJ: adj purge context : 2880/2936 ( 98%) [1]
> ADJ: adjacency : 132512/132736 ( 99%) [4]
> ADJ: sevs : 10064/10120 ( 99%) [1]
> CEF: Brkr Consumer : 288/624 ( 46%) [6]
> CEF: Brkr Mcast grp : 240/576 ( 41%) [6]
> CEF: Brkr Update Rec : 74992/75104 ( 99%) [2]
> CEF: Brkr VRF group : 144/480 ( 30%) [6]
> CEF: Brkr zone : 320/992 ( 32%) [12]
> CEF: Broker : 912/1248 ( 73%) [6]
> CEF: Brokers Array : 56/112 ( 50%) [1]
> CEF: EVENT msg chunks : 5000/5056 ( 98%) [1]
> CEF: FIB LC : 6800/6856 ( 99%) [1]
> CEF: FIB LC array : 168/224 ( 75%) [1]
> CEF: FIB LC stats array : 6688/6744 ( 99%) [1]
> CEF: FIBHWIDB : 40848/44712 ( 91%) [69]
> CEF: FIBIDB : 13864/17728 ( 78%) [69]
> CEF: FIBSWSB control : 792/1296 ( 61%) [9]
> CEF: HWIDB MAP TABLE : 25200/25256 ( 99%) [1]
> CEF: IPv4 ARP throttle : 1024/1080 ( 94%) [1]
> CEF: IPv4 not-sw cnt : 72/128 ( 56%) [1]
> CEF: IPv4 not-sw si : 72/128 ( 56%) [1]
> CEF: IPv4 process : 408/744 ( 54%) [6]
> CEF: TABLE msg chunks : 20000/20056 ( 99%) [1]
> CEF: Table LC info : 344/400 ( 86%) [1]
> CEF: Table active slot in : 48/104 ( 46%) [1]
> CEF: arp throttle chunk : 14096/14152 ( 99%) [1]
> CEF: dQ elems : 78736/78848 ( 99%) [2]
> CEF: dQ walks : 920/1032 ( 89%) [2]
> CEF: fib : 327680/327960 ( 99%) [5]
> CEF: fib GSB : 65536/65592 ( 99%) [1]
> CEF: fib deps : 3520/3632 ( 96%) [2]
> CEF: fib its : 10648/10760 ( 98%) [2]
> CEF: fib_fib msg chunks : 65536/65592 ( 99%) [1]
> CEF: fib_fib_s : 6000/6112 ( 98%) [2]
> CEF: fib_fib_src_adj_sb : 3000/3056 ( 98%) [1]
> CEF: fib_fib_src_special_ : 3000/3056 ( 98%) [1]
> CEF: fibidb table : 25200/25256 ( 99%) [1]
> CEF: hash table : 262144/262256 ( 99%) [2]
> CEF: hwapi swobj walks : 1656/1768 ( 93%) [2]
> CEF: loadinfos : 33488/33600 ( 99%) [2]
> CEF: mpls long path exts : 69728/69840 ( 99%) [2]
> CEF: mpls path exts : 73824/73936 ( 99%) [2]
> CEF: nh entry context : 10808/10920 ( 98%) [2]
> CEF: non_ip entry context : 10720/10832 ( 98%) [2]
> CEF: oce dependent walks : 912/1024 ( 89%) [2]
> CEF: path list dependents : 10648/10760 ( 98%) [2]
> CEF: pathl : 31944/32280 ( 98%) [6]
> CEF: pathl ifs : 5648/5760 ( 98%) [2]
> CEF: pathl its : 10648/10760 ( 98%) [2]
> CEF: paths : 41984/42432 ( 98%) [8]
> CEF: prefix query msg chu : 20000/20056 ( 99%) [1]
> CEF: table : 1672/1784 ( 93%) [2]
> CEF: table index : 25200/25256 ( 99%) [1]
> CEF: table walks : 488/600 ( 81%) [2]
> CEF: terminal fibs list : 144/480 ( 30%) [6]
> CEF: up event chunk : 20000/20056 ( 99%) [1]
> Memory in use/allocated Count
> ------------------------------------------------------------------
>
> CEF: xdr msg chunks : 32768/32824 ( 99%) [1]
> CEF:test fib entry sbs : 3000/3056 ( 98%) [1]
> COLL: coll rec : 72184/72296 ( 99%) [2]
> TAL: MTRIE n08 : 197640/197976 ( 99%) [6]
> TAL: control block : 40/96 ( 41%) [1]
> TAL: item list elem : 65536/65592 ( 99%) [1]
> TAL: mtrie control block : 1656/1712 ( 96%) [1]
> TAL: rtree aux : 56/112 ( 50%) [1]
> TAL: rtree control block : 40/96 ( 41%) [1]
> TAL: rtree nodes : 21760/21872 ( 99%) [2]
> TAL: tree control : 80/192 ( 41%) [2]
> ------------------------------------------------------------------
> Totals : 1975744/1992712 ( 99%) [303]
>
>
> Peter Kranz
> Founder/CEO - Unwired Ltd
> www.UnwiredLtd.com
> Desk: 510-868-1614 x100
> Mobile: 510-207-0000
> pkranz at unwiredltd.com
>
>
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