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Forum Replies

  1. Tunnel interface ip is not required.is it not necessary?

  2. IPv6 uses the link-local addresses as the next-hop for routing entries so there is no need to configure a “global” IPv6 address.

  3. Hello Rene,
    I was testing these two different manual tunneling types in the lab and wanted to confirm what one should see as that expected MTU for GRE vs. the manual tunnel? I know that you state GRE has a higher MTU, but that was not what I observed in the testing. Also not 100%

    R6#sh int tunn0
    Tunnel0 is up, line protocol is up 
      Hardware is Tunnel
      MTU 17916 bytes, BW 100 Kbit/sec, DLY 50000 usec, 
         reliability 255/255, txload 1/255, rxload 1/255
      Encapsulation TUNNEL, loopback not set
      Keepalive not set
      Tunnel linestate evaluation up
      Tunnel sour
    ... Continue reading in our forum

  4. The major differences:

    MCT - MTU is 1480, less overhead, supports only a single passenger protocol, mode is ipv6ip.

    GRE - MTU is 1476, more overhead, supports multiple passenger protocols, mode is gre.

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