Hi, Ok so you have already taken care of the TCP operation tuning so that the MSS can be cranked up to max. Please be aware that the MSS is determined only during session initiation as the TCP MSS option is carried only in the SYN and corresponding SYN/ACK. So you might need to bounce the session in order to get the advantage of the new MSS determined by the PMTUD.
BGP Update Generation. Should be taken care of automatically. Though it is good to check the number of update groups. Queue Optimization. 1) Selective Packet Discard (SPD) Headroom. Increase the SPD Headroom from default 1000. Increase the SPD Extended Headroom from default 10 -only if you see problems with L2 keepalives. 2) (if the above does not help). Input hold queue. -increase the default value of 75 based on max possible number of TCP ACKs + additional traffic for PRP. (if you still see input drops) . -increase min and max thresholds. -and turn on aggressive mode to only drop malformed packets. 3) System buffers. To handle a large influx of TCP ACK messages 64 bytes long thus stored in small buffers. - Permanent buffers. - Min-free. - Max-free. I guess I'd have to refer you to the Cisco Press book: "BGP Design and Implementation". Chapter 3; Tuning BGP Performance - in particular. Yes the book is old but lays on a great foundation on understanding all the different aspects of BGP fine tuning. adam -----Original Message----- From: cisco-nsp [mailto:[email protected]] On Behalf Of arulgobinath emmanuel Sent: Wednesday, May 08, 2013 10:51 AM To: Cisco Network Service Providers Subject: [c-nsp] Any BGP fine tuning recommendation while Peering in IX Hi all, what are the common BGP fine tuning best practices while peering more than 200 - 300 peering. except to the Path MTU , peer group i'm observing when the RR flaps CPU goes high ( GSR 12406 / PRP-2/ 12.0(33)S10 ) and due to that input queue on the interface goes high and it causes random flap on almost half of the peer . Thanks in advance, Gobinath _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
