Which measure does ISIS use to avoid sending traffic with a wrong MTU configuration?
A.
ISIS does not protect from MTU mismatch.
B.
MTU value is communicated in ISIS Sequence Number PDUs (SNP), and ISIS adjacency is not
established if an MTU mismatch is detected.
C.
ISIS uses path MTU discovery as specified in RFC 1063.
D.
ISIS uses padding of hello packets to full MTU.
Intermediate System-to-Intermediate System (IS-IS) hellos are padded to the full maximum
transmission unit (MTU) size. The benefit of padding IS-IS Hellos (IIHs) to the full MTU is that it
allows for early detection of errors due to transmission problems with large frames or due to
mismatched MTUs on adjacent interfaces.
Reference. http://www.cisco.com/c/en/us/support/docs/ip/integrated-intermediate-system-tointermediate-
system-is-is/47201-isis-mtu.html
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