[c-nsp] maximum dCEF routes on GSR engine 2 cards

[Oliver Boehmer (oboehmer)]

John,

number of prefixes for an Engine2 linecard depends on the features used
(VRFs, ACLs) and the way CEF allocates their memory (for example number
of loadinfos when you do any form of multipath). 
Can you show a "show ip route sum", "show ip cef summ" as well as an
"execute-on slot 3 show contr psa mem"? 
You can also check the Release-notes of CSCdt34374 for some info.

Engine0 don't have any dedicated forwarding memory, so Engine0 prefix
capacity is limited by LC DRAM only.

With the growth of the Internet routing table, E2 fowarding capactiy can
reach its limits depending on ACLs configured on the box.   

	oli


John van Oppen <> wrote on Sunday, July 29, 2007 8:10 AM:

> I am running into a problem where I am running out of dCEF resources
> on a couple of engine 2 line cards (both of the suspect cards are
> three port gigE cards) in my 12008s.   Anyone have hints on getting
> this usage under control or at least some actual numbers on what the
> actual maximum routing table size in the hardware forwarding table
> (since the E2_RX_TLU indicator seems to indicate forwarding entries).
> 
> Interestingly this is not affecting the engine 0 line cards in the
> routers, and I was wondering if anyone else with a full view of the
> routing table was having this happen?   It seems on my side to just
> have started one day and immediately have gone from a yellow alarm to
> 100% utilization, so it seems to me like something could be wonky.
> 
> 
> router>show ip cef re
> 
> Hardware resource allocation status summary
> 
> Green (Normal), Yellow (Caution) Red (Alarm)
> 
> Slot HW Resource Name        Util     Alert
> 
> 2    E2_Rx_PLU                29        G
> 
> 2    E2_Rx_TLU                100       R
> 
> 3    E2_Rx_PLU                29        G
> 
> 3    E2_Rx_TLU                100       R
> 
> 
> 
> 
> 
> Both cards are the following:
> 
> 
> 
> router#show cef line 3
> 
> CEF linecard slot 3, status up, fibhwidb sync, fibidb sync, adj sync
> 
>  Sequence number 20688, Maximum sequence number expected 21193, Seq
> Epoch 2
> 
>  Send failed 0, Out Of Sequence 0, drops 0
> 
>  Linecard CEF reset 2, reloaded 2
> 
>  2091179 elements packed in 32971 messages(72011038 bytes) sent
> 
>  32 elements cleared
> 
>  0/0/0 xdr elements in LowQ/MediumQ/HighQ
> 
>  247773/34/286 peak elements on LowQ/MediumQ/HighQ
> 
>  Keepalive timer will expire in 00:05:59
> 
>  Init window timer is not running
> 
>  Input  packets 1904878439, bytes 1322133076937
> 
>  Output packets 1631996819, bytes 1062121911533, drops 0
> 
>  UTI input packets 0, bytes 0
> 
>  UTI output packets 0, bytes 0
> 
>  0 proc sw, 0 proc sw fail, 0 hdr error
> 
> 
> 
>  CEF Table statistics:
> 
>  Table name                Version Prefix-xdr Status
> 
>  Default                    404607     702947 Active, sync, table-up
> 
> 
> 
> 
> 
> router#show diag 3
> 
> 
> 
> SLOT 3  (RP/LC 3 ): 3 Port Gigabit Ethernet
> 
>   MAIN: type 68,  800-6376-05 rev B0
> 
>         Deviation: 0
> 
>         HW config: 0x00    SW key: 00-00-00
> 
>   PCA:  73-4775-07 rev C0 ver 2
> 
>         Design Release 2.0  S/N SAD09100D9E
> 
>   MBUS: Embedded Agent
> 
>         Test hist: 0x00    RMA#: 00-00-00    RMA hist: 0x00
> 
>   DIAG: Test count: 0x00000000    Test results: 0x00000000
> 
>   FRU:  Linecard/Module: 3GE-GBIC-SC=
> 
>         Processor Memory: MEM-GRP/LC-256=
> 
>         Packet Memory: MEM-LC1-PKT-256=
> 
>   L3 Engine: 2 - Backbone OC48 (2.5 Gbps)
> 
>   MBUS Agent Software version 1.100 (RAM) (ROM version is 2.41)
> 
>   ROM Monitor version 16.12
> 
>   Fabric Downloader version used n/a (ROM version is 10.1)
> 
>   Primary clock is CSC 1
> 
>   Board is analyzed
> 
>   Board State is Line Card Enabled (IOS  RUN )
> 
>   Insertion time: 15w2d (1d09h ago)
> 
>   Processor Memory size: 268435456 bytes
> 
>   TX Packet Memory size: 134217728 bytes, Packet Memory pagesize: 8192
> bytes
> 
>   RX Packet Memory size: 134217728 bytes, Packet Memory pagesize: 8192
> bytes
> 
>   0 crashes since restart
> 
> 
> 
> 
> 
> Any ideas on optimization would be appreciated.
> 
> 
> 
> John
> 
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