[c-nsp] Maximum number of routes on Cisco 7301 NSE100

[Sam Stickland]

Neil Fenemor wrote:
> I've recently been doing testing with a 7200 on this very idea. I've 
> found that the DFZ currently consumes around 338MB of memory in way of 
> the BGP process, whereas storing the DFZ in the global table consumes 
> 130MB.  That is with approximately 255k routes.
>
> I hope this helps.
>
> Kind Regards,
>
> Neil Fenemor
> FX Networks 
Hi Neil,

Thanks for the response. The figures seem high. Placing the DFZ in a VRF 
doesn't seem to eat anything like this much memory on a 7600, so I'm 
suprised that a 7200 needs so much more. Does the TCAM on the 7600 
really keep this much usage out of the RAM?

The total memory usage is around 340MB, but the BGP process usage is 
much smaller.

#sh ip bgp vpnv4 vrf Internet sum
BGP router identifier X.X.X.X, local AS number XXXXX
BGP table version is 27464534, main routing table version 27464534
253414 network entries using 34717718 bytes of memory
253412 path entries using 16218368 bytes of memory
44642/44635 BGP path/bestpath attribute entries using 4464200 bytes of 
memory
40323 BGP AS-PATH entries using 1041650 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP using 56441936 total bytes of memory
12 received paths for inbound soft reconfiguration
BGP activity 1200854/947440 prefixes, 7773339/7519927 paths, scan 
interval 15 secs

#sh memory allocating-process  totals
                Head    Total(b)     Used(b)     Free(b)   Lowest(b)  
Largest(b)
Processor   44A84700   928463104   345400216   583062888   516925392   
510641784
      I/O    8000000    67108864    11891816    55217048    55141088    
55141048

Allocator PC Summary for: Processor

    PC          Total   Count  Name
0x42044BA4   49915568     761  TFIB tag_rewri
0x4092B86C   48800448     744  IP subnet NDB
0x413ED520   41768160    1240  FIB 1 path chu
0x403007B4   40667040     620  VPNv4 Unicast
0x40586288   26182120       5  Init
0x40300630   25646528     391  VPNv4 Unicast
0x42044C4C   22366872     341  TFIB tag_info
0x4092E9CC   21317400     325  IP RDB Chunk
0x413ED650   14187104     430  IP mtrie node
0x402C798C    9248528     141  BGP battr chun
0x4161478C    7531464    8637  *Packet Header*
0x420403B0    4410088       1  TFIB
0x41CD3098    2632032     322  Interrupt Stack
0x40300AD0    2461800      75  BGP (0) attr
0x417AF48C    2211896       1  CWAN LTL PW info
0x41251788    1481472   12342  Init
0x41B3D2F4    1375920    4095  PM vlan non trunk portlist
0x40FBD420    1063744      67  List Elements

Sam


>
>
>
> On 7/06/2008, at 12:57 AM, Sam Stickland wrote:
>
>> Sam Stickland wrote:
>>> Hi,
>>>
>>> Does anyone know what the maximum number of (IPv4 unicast) routes 
>>> these can take? They have 512MB of RAM, which I believe is the 
>>> maximum for this model.
>> Actually, I should clarify. We need to know if it can take two full 
>> feeds in a VRF (VRF lite, with minimal management only routes in the 
>> global table). These are an unusual platform for us so I don't have 
>> any spare that I can put into a lab.
>>
>> Despite the PXF hardware feature I don't think they use TCAM to store 
>> the FIB, so I guess the amount of memory consumed is going to depend 
>> on the IOS release. These are currently running 12.2(28)SB5.
>>
>> I've seen this page but there's no info regarding maximum supported 
>> routes:
>>
>> http://www.cisco.com/en/US/prod/collateral/routers/ps352/product_data_sheet09186a0080092263.html 
>>
>>
>> Hopefully someone else out there has a similar configuration and they 
>> can post the memory usage.
>>
>> Thanks,
>>
>> Sam
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>
> Neil Fenemor
> FX Networks
>
>