Juniper IGP - CONFIGURATION GUIDE V11.1.X, Руководство по настройке

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Use the no version to halt tracking of the next hop.
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See ip share-nexthop
Moving IP Interfaces
You can move an IP shared interface from one layer 2 interface to another by issuing
the
ip share-interface command to specify a different layer 2 interface. Moving an
IP interface does not affect interface statistics, packets forwarded through the
interface, or policies attached to the IP interface.
Example
The following commands create shared interface si0 on the layer 2 interface
atm5/3.101:
host1(config)# virtual-router vr-a:vrf-1
host1:vr-a:vrf-1(config)# interface ip si0
host1:vr-a:vrf-1(config-if)# ip share-interface atm 5/3.101
host1:vr-a:vrf-1(config-if)# exit
The following commands move shared interface si0 to the layer 2 interface
atm5/3.201:
host1:vr-a:vrf-1(config)# interface ip si0
host1:vr-a:vrf-1(config-if)# ip share-interface atm 5/3.201
IP Shared Interface Statistics
Each shared interface has its own statistics. Packets transmitted on a shared IP
interface are always counted only in the shared IP interface.
Subscriber Interfaces
A subscriber interface is an extension of a shared IP interface. Shared IP interfaces
are unidirectional—they can transmit but not receive traffic. In contrast, subscriber
interfaces are bidirectional—they can both receive and transmit traffic.
For details about configuring and using subscriber interfaces, see JUNOSe Broadband
Access Configuration Guide .
Internet Control Message Protocol
IP was not designed to provide reliable delivery service. The higher-layer protocols
that operate as clients of IP implement their own reliability procedures if reliable
communications are required.
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. ICMP messages provide feedback about problems that occur in the
communication environment.
Internet Control Message Protocol
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Chapter 1: Configuring IP