Command Description
no ip route Removes a static route
ip routing Enable IP routing
show ip route Display information about the IP routing table
show ip route
best-match
Display a routing table for a destination address
show ip route
static
Display static routes
show ip route
summary
Display the number of routes known to the device
show ip route
track-table
Display all routes with configured object trackers
traceroute Trace the route packets are taking to a particular IP address by
displaying the hops along the path
The Branch Gateway traces the route by launching UDP probe
packets with a small TTL, then listening for an ICMP time
exceeded reply from a gateway.
You can also trace the route inside a locally-terminated tunnel
(GRE, VPN)
GRE tunneling
Generic Routing Encapsulation (GRE) is a multi-carrier protocol that encapsulates packets
with an IP header and enables them to pass through the Internet via a GRE tunnel. A GRE
tunnel is a virtual interface in which two routers serve as endpoints. The first router
encapsulates the packet and sends it over the Internet to a router at the far end of the GRE
tunnel. The second router removes the encapsulation and sends the packet towards its
destination.
A GRE tunnel is set up as an IP interface, which allows you to use the GRE tunnel as a routing
destination. A GRE tunnel can transport multicast packets, which allows it to work with routing
protocols such as RIP and OSPF.
To set up a GRE tunnel, you must create the interface and assign it an IP address, a tunnel
source address, and a tunnel destination address. GRE tunnels can be configured as next
hops on static routes and policy-based routing next hop lists. Packets can also be routed to
GRE tunnels dynamically.
The router
434 Administering Avaya G430 Branch Gateway October 2013
Comments? infodev@avaya.com
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