[c-nsp] 12k Full BGP Feed Memory Requirements

[Ryan Werber]

>-----Original Message-----
>From: Antonio Soares [mailto:amsoares at netcabo.pt] 
>Sent: Friday, June 05, 2009 4:14 AM

>Wow, this is unbelievable ! Can you show us your "show proc mem | inc
BGP" ? Do you really have two full BGP feeds (about 284k
>prefixes each) ?




#show proc memory  | i BGP
 169   0 2895956668 1123582500  310165452          0          0 BGP
Router
 172   0    3975400 1008225208       6840      53464          0 BGP I/O
 173   0       4188   12111120      14028          0          0 BGP
Scanner

First one is Cogent (174), the Second one is Tiscali (3257).  There are
4 Ibgp Route-Servers as well. we have ~10 full transit feeds throughout
our asn, as well as a ton of peering.  The only thing changed below are
ip addresses to protect the innocent. We currently have ~130 meg free on
the GRP-B. We also have 1 directly connected eBGP IPv6 peer, and 5
throughout our ASN.

38.103.xx.xx   4   174 3895305   60405 22155189    0    0 5w6d
283503
77.67.xx.xx    4  3257 5813157  139266 22155189    0    0 6w6d
282571
PEER-RS-1      4 21513 2472535 3813308 22155189    0    0 15:25:46
100863
RS-1           4 21513 4092583 3613405 22155189    0    0 6w6d
265775
RS-2           4 21513 3244549 3613398 22155189    0    0 6w6d
267897
RS-3           4 21513 5660680 3711962 22155189    0    0 1w1d
284664

show ip cef summary
IP Distributed CEF with switching (Table Version 8565971), flags=0x0
  288375 routes, 0 reresolve, 0 unresolved (0 old, 0 new), peak 18273
  8561775 instant recursive resolutions, 0 used background process
  12 load sharing elements, 12 references
  1389 in-place/0 aborted modifications
  57883336 bytes allocated to the FIB table data structures
  universal per-destination load sharing algorithm, id 6CE54348
  2(0) CEF resets
  Resolution Timer: Exponential (currently 1s, peak 4s)
  Tree summary:
   8-8-8-8 stride pattern
   short mask protection disabled
   288375 leaves, 14605 nodes using 23265244 bytes
  Transient memory used: 149355436, max: 149395476

  Table epoch: 0 (288375 entries at this epoch)

Adjacency Table has 41 adjacencies
  34 IPv4 adjacencies
  7 IPv6 adjacencies