We were told that there is an issue (overlapping register usage) when you enable Q-in-Q and NAM Monitor ports and also use dot1q encapsulation that can cause traffic to stop flowing.
We had heard that you need to use ISL trunking instead of dot1q trunking for the service provider trunks.
We need to know whether or not we absolutely have to use ISL for the service provider trunking.
Can anyone verify and know of supporting documentation of this supposed restriction.
We've searched high & low and can't find anything to verify/support this.
The system environment is 6509s SUP720-3B 12.2(18)SXF and 12.2(33)SXI
NAM-2 running 4.0(1)