[c-nsp] ME3600/M3800 BGP Limits

[Adam Vitkovsky]

Hi James,

Oh man you just made my day, full-mesh between 82 MEs that's ...bold!
Unfortunately I don't know what the limit is.


adam
> -----Original Message-----
> From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of
> James Bensley
> Sent: 19 February 2015 13:56
> To: cisco-nsp at puck.nether.net
> Subject: [c-nsp] ME3600/M3800 BGP Limits
> 
> Hi All,
> 
> This Cisco page states that both the ME3600 and ME3800 have a max
> limit of 100 BGP sessions irrelevant of license:
> 
> http://www.cisco.com/c/en/us/td/docs/switches/metro/me3600x_3800x/s
> oftware/release/15-3_3_S/release/notes/ol29977.html#43004
> 
> http://www.cisco.com/c/en/us/td/docs/switches/metro/me3600x_3800x/s
> oftware/release/15-3_3_S/release/notes/ol29977.html#66855
> 
> What does that mean exactly? Does it mean 100 BGP sessions can be
> active in any one given address family, or across all
> address-families? Does it mean that  more than 100 can be defined in
> the case of inactive neighbours but only 100 established neighbours
> are allowed? Or somethign else?
> 
> Is it perhaps not a hard coded limit but just a recommendation?
> 
> 
> I am looking at an example PE in a private WAN made from many 3600's
> and 3800's running 15.3(3)S. "show bgp all summary" tells me that
> there are 83 established IPv4 BGP neighbours with which routes are
> being exchanged (this WAN has a full iBGP mesh for MPLS-TE, no IPv6).
> 
> "show bgp all summary" show's me the same 83 IP addresses as active
> under the VPNv4 section becasue there are the loopsbacks of all the
> other PEs in the WAN.
> 
> However under the VPNv4 section of "show bgp all summary" I am also
> shown all the CPEs peering with this example PE. There are 72 active
> CPE facing BGP session (terminated into various different customer
> VRFs).
> 
> So under "show bgp all summary" I am actaully shown a list of 155
> established BGP neighbours with which routes are being exchange, they
> are not in stuck in Idle or Active etc (this list is longer if you
> includes those!) so what is the 100 BGP session limit *exactly*?
> 
> 
> Cheers,
> James.
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