Hi all
I have the same issue ad atarsha. Please refer to the attached picture.
The internal bgp session has negotiated TCP MSS 4096 although the physical layer 2 transport has mtu 1514.
@MX3# run show bgp neighbor 10.0.0.2 | match Option
Options: <Preference LocalAddress Refresh>
Options: <MtuDiscovery>
@MX2# run show bgp neighbor 10.130.0.19 |match Option
Options: <Preference LocalAddress Refresh>
Options: <MtuDiscovery>
tcp4 0 0 10.0.0.2.179 10.130.0.19.65426 ESTABLISHED
rttmin: 1000 mss: 4096
tcp4 0 0 10.130.0.19.65426 10.0.0.2.179 ESTABLISHED
rttmin: 1000 mss: 4096
Indeed the ICMP max end-to-end size in 1472 bytes
@MX3# run ping 10.0.0.2 source 10.130.0.19 size 1472 do-not-fragment count 100 rapid
PING 10.0.0.2 (10.0.0.2): 1472 data bytes
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
--- 10.0.0.2 ping statistics ---
100 packets transmitted, 100 packets received, 0% packet loss
round-trip min/avg/max/stddev = 0.968/1.058/2.290/0.168 ms
[edit]
@MX3# run ping 10.0.0.2 source 10.130.0.19 size 1473 do-not-fragment count 100 rapid
PING 10.0.0.2 (10.0.0.2): 1473 data bytes
.................................................^C
--- 10.0.0.2 ping statistics ---
50 packets transmitted, 0 packets received, 100% packet loss
Any suggestion?
Thansk in advice
Antonio