On 7/24/13 6:15 PM, Marc, LX1DUC wrote:
(BTW IS-IS probably wouldn't work that well over Layer3 tunnels AFAIK, as it is itself a Layer3 protocol and would need to be transported over a Layer2 link (please correct me if I'm wrong))
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.
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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_note09186a0080...
73 de Marc, LX1DUC
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Bryan Fields -
Marc, LX1DUC