IOS(XR) MTU
There were a number of TCP enhancements that went in around the 5.1
timeframe which impact the way window scaling works as well.
Also, do you have path-mtu enabled on all the devices?
on XR you want something like this:
tcp selective-ack
tcp window-size 65535
tcp path-mtu-discovery
IOS:
ip tcp path-mtu-discovery
ip tcp window-size 65535
http://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/ios-xr-software/116350-trouble-ios-xr-mtu-00.html
> interface GigabitEthernet0/0/1 no ip address
>
> service instance 100 ethernet
> xconnect x.x.x.x {VC_ID} encapsulation mpls mtu {}
>
> But If I configured the below
> l2vpn xconnect context {NAME}
>
> There is no option for the MTU under it
You have to configure it on the pseudowire interface: