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On 25/07/2013 01:54, Bryan Fields wrote:
IS-IS will work fine over GRE. GRE forms an interface
over which
IP/CLNS can function. Multicast and broadcast traffic works over
this as well.
By defautl GRE provides an Layer3 MTU of 1476 bytes. How will you cope
with packet fragmentation or in case DF=1 with ICMP type=3 code=4 (The
datagram is too big. Packet fragmentation is required but the 'don't
fragment' (DF) flag is on.) filtering.
CISCO has published several documents concerning that issue, one for
example is
http://www.cisco.com/en/US/tech/tk827/tk369/technologies_tech_note09186a008…
73 de Marc, LX1DUC
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