Icmp Support; Ipv6 Tunnel Routing Table; Indirect Next Hop Support - Juniper IGP - CONFIGURATION GUIDE V11.1.X Configuration Manual

ICMP Support

Internet Control Message Protocol (ICMP) provides a mechanism that enables a router
or destination host to report an error in data traffic processing to the original source
of the packet. For this release, the E Series router supports ICMP for use in the IPv6
ping and traceroute commands.
The ping and traceroute commands help you determine destination reachability
within a network.

IPv6 Tunnel Routing Table

The IPv6 tunnel routing tables include IPv6 routes that point only to tunnels, such
as MPLS tunnels. The tunnel routing table is not used for forwarding. Instead, protocols
resolve next hops by looking up the routes that point to tunnels. The routes in the
tunnel routing table cannot be redistributed. See JUNOSe BGP and MPLS Configuration
Guide for more information.

Indirect Next Hop Support

The router uses indirect next hops to promote faster network convergence (for
example, in BGP networks) by decreasing the number of routing table changes
required when a change in the network topology occurs.
Direct next-hops point routes in the routing table toward individual, direct next-hop
connections. (See Figure 14 on page 132.)
Use the ping ipv6 command to send an ICMP echo request packet. In the
following example, the request packet is sent to address 1::1 with a data size of
200 and a timeout value of 10 seconds:
host1#ping ipv6 1::1 data-size 200 timeout 10
Use the traceroute ipv6 command to discover routes that router packets follow
when traveling to their destination. In the following example, the trace destination
address is 1::1, the maximum number of hops of the trace is 20, and the timeout
value is 10 seconds:
host1#traceroute ipv6 1::1 hop-limit 20 timeout 10
Chapter 2: Configuring IPv6
131
IPv6 Overview