I am working at small SP. we are going to enable Jumbo Frame support from end to end. Our core segment have MPLS cloud and packet size could be able support up over 9000 already. Since our Core segment router are running pure BGP with our edge/access segment router , when I enable jumbo frame support on their interface level, I still can see BGP MSS size is 1260 right now. so my question, do I need increase BGP MSS size between our core router and edge router for transiting our SP cloud traffic packet ?
I have other question about MSS size for IPv4 and IPv6 BGP session, if the physical link MTU size is 1500 ( same as 1514 on ASR 9K platform), why IPv6 BGP MSS is 1240 and IPv6 BGP MSS is 1220? As I only understand IPv4 headr 20, tcp header 20, but didn't match these MSS size number, I am sure I mis-understand some value in between, could you please let me know how we get 1240 and 1220?
If tcp PMTUD is disabled and the session is not to a directly connected interface, the path mtu is set to the minimum MTU defined for ipv6 (1280). From that value, you substract 40 bytes for the ipv6 header and 20 bytes for the tcp header, hence the 1220 value that you saw for your ipv6 tcp session.
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