[j-nsp] juniper / mx series fib usage information?

[Richard A Steenbergen]

On Tue, Feb 08, 2011 at 07:08:21PM -0600, Michael Hare wrote:
> Hello-
> 
> A quick google didn't help; is there a way to tell how much space you 
> have left in your FIB [absolute RAM, percentage, whatever], specifically 
> for an MX with DPCs?

ras at re1.router> start shell pfe network fpc0 

ADPC platform (1200Mhz MPC 8548 processor, 1024MB memory, 512KB flash)

ADPC0(re1.router vty)# sh jtree 0 memory      
Jtree memory segment 0 (Context: 0x4430cfd0)
-------------------------------------------
Memory Statistics:
   16777216 bytes total
    6366560 bytes used
   10407144 bytes available (6060032 bytes from free pages) <-----------
       3024 bytes wasted
        488 bytes unusable
      32768 pages total
      11529 pages used (2568 pages used in page alloc)
       9403 pages partially used
      11836 pages free (max contiguous = 11285)

You can also see a breakdown of the individual services like so, but the 
output above will take multiple tables into account and show you the 
true utilization on the rldram. In a default configuration, segment 0 is 
your routing memory, segment 1 is your firewall filters.

ADPC0(re1.router vty)# sh jtree 0 summary
     Protocol      Routes  Bytes Used
-------------  ----------  ----------
         IPv4      341307     4906680
         IPv6        4579       84256
         MPLS         487        6792
Multi-service           1          16

> I am contemplating activating cymru fullbogons [v4/v6].  We currently 
> carry about 350,000k v4 and 5000k v6 routes.
> 
> While initially I'm not worried, my gut tells me the v6 fullbogons 
> feed will not be sustainable as it is already at 30k route for ~5k 
> active v6 announcements.  While their template doesn't suggest so, I 
> plan to put in ingress prefix-limit maximum on their sessions to 
> something 'reasonable'.

Carrying a bogons bgp feed is pretty darn close to worthless really, but 
you're in no danger of bumping an MX's route capacity unless you're 
running multiple tables.

-- 
Richard A Steenbergen <ras at e-gerbil.net>       http://www.e-gerbil.net/ras
GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC)