Outlines verification steps to confirm TCP MSS and don't clear fragment configurations, detailing command outputs and expected results to validate correct implementation.
TCP MSS configuration
The following is sample output of the show platform hardware qfp active feature sdwan datapath session summary command:
Device# show platform hardware qfp active feature sdwan datapath session summary
Src IP Dst IP Src Port Dst Port Encap Uidb Bfd Discrim PMTU
------ ------ -------- ------- ------ ------- ----------- -----
10.1.15.25 10.1.14.14 12347 12346 IPSEC 65526 10007 1446
10.1.15.25 10.0.5.21 12347 12357 IPSEC 65526 10009 1446
10.1.15.25 10.0.5.11 12347 12347 IPSEC 65526 10008 1446
10.1.15.25 10.1.16.16 12347 12366 IPSEC 65526 10006 1446
Dont fragment configuration
The following is sample output of the show platform software interface rp active name Tunnel1 command to verify if Clear-dont-fragment is enabled or not.
Device# show platform software interface rp active name Tunnel1 | include dont
IP Clear-dont-fragment: TRUE
The following is sample output of the show running-config interface Tunnel1 command that displays the running configuration when Clear-dont-fragment is enabled.
Device# show running-config interface Tunnel1
Building configuration...
Current configuration : 132 bytes
!
interface Tunnel1
ip unnumbered GigabitEthernet1
ip clear-dont-fragment
tunnel source GigabitEthernet1
tunnel mode sdwan
end