INE R&S ATC042 - Reliable Backup Interface with GRE

debug tunnel keepalive

GRE / IP Protocol Number 47
IPv6 / IP Protocol Number 41
IP in IP / IP Protocol Number 4

R5可使用Tuunel當成Reliable Interface...主線從FR建Tunnel至R4.....備援走R4

R5連R4

int tunnel 45
  backup interface serial 0/1/0

ip route 0.0.0.0 0.0.0.0 tunnel 45
ip route 0.0.0.0 0.0.0.0 serial 0/1/0 10

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Google: ip protocol number

Protocol Numbers
http://www.iana.org/assignments/protocol-numbers/protocol-numbers.xhtml