I faced with issue on ME3800.
description ### Staging LRS ###
ip dhcp relay information trusted
ip address 10.186.71.1 255.255.255.0 secondary
ip address 10.127.254.1 255.255.255.0
ip helper-address 22.214.171.124
no ip redirects
no ip unreachables
no ip proxy-arp
ip pim sparse-mode
With that configuration there is no problem with DHCP Relay packets.
But if I add on interface #xconnect 126.96.36.199 77 encapsulation mpls it will stop forward DHCP relay packets immediately. All other traffic transfers without problem.
Cisco IOS Software, ME380x Software (ME380x-UNIVERSAL-M), Version 15.1(2)EY1a
Who can explain where is the cause of issue?