[c-nsp] Which is the actual TCP MSS for this iBGP connection on ASR9K running IOS-XR?

[Everton Marques]

Hi all,

I have this iBGP session established between a Cisco ASR9K and a Cisco 7600
router.

On the ASR9K device, 'show tcp detail pcb all' displays 'MSS 1240, peer MSS
9152, min MSS 1240, max MSS 1240' for this specific iBGP connection.

Which is the actual TCP MSS value the ASR9K is using for that connection?
Is it 1240 or 9152?

See more outputs for this TCP connection below.

ASR9K#show tcp detail pcb all
(...snip...)
Datagrams (in bytes): MSS 1240, peer MSS 9152, min MSS 1240, max MSS 1240

7600#show ip bgp neighbors X.X.X.X | i Dat
Datagrams (max data segment is 1240 bytes):

7600#show tcp
(...snip...)
Datagrams (max data segment is 1240 bytes):

Thanks,
Everton