Does anyone test the BGP PMTUD on Huawei NE20 and NE40 on iBGP peers? The Huawei behaviour is different than Cisco, especially on v8.120 on NE20.
* When BGP PMTUD is disabled on both peers, BGP MSS is still 8960 (when all interface MTUS are 9000). If discovery is disabled, an interface MTU on the path can be default (as 1500) so this shouldnt be 8960 as my understanding on RFC.
* When BGP PMTUD is enabled and some interface MTUs on path are changed to 6000;
** the v8.120 shows MSS as 1460 (which is not OK),
** the v5.160 shows MSS as 5960 (which is OK).
Huawei NE20E Version 8.120 (NE20E V800R008C10SPC300)
Huawei NE40E Version 5.160 (NE40E&80E V600R008C10SPC300)
Not: Also icmp protocol 1 is permittedon all devices.
Is there any difference on default config between the peers? Or what is the Huawei behaviour on BGP PMTUD?
Thanks,