You want to use IS-IS on a GRE interface where the underlying Layer 3 MTU is 1500. Which statement is correct in this scenario?
A.
IS-IS can be used because every IS-IS interface must be capable of transmitting packets at least as large as 1476 bytes, and the GRE header is 24 bytes.
B.
IS-IS can be used, but the networking device directly attached to the circuit must be capable of fragmentation.
C.
IS-IS cannot be used, but the router can enable a GRE key that serves the same function as IS-IS.
D.
IS-IS cannot be used because the IS-IS hello is not allowed to be fragmented and has the DF bit set.
ISIS header is 1492 and GRE is 24. 1492+24=1516Bytes. So, fragmentation is required.
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DIbyam
2 years, 6 months ago