Avaya 4524GT, Руководство по настройке

Страница: 34 / 362

Feature IPv4 IPv6
Multicast membership IGMP Multicast Listener Discovery
(MLD)
Router discovery
2
Optional Required
Uses broadcasts Yes No
Configuration
3
Manual, DHCP Manual
1
Ethernet Routing Switch 4500 Series does not support IPsec.
2
Ethernet Routing Switch 4500 Series does not perform Router discovery or advertise as
a router.
3
Ethernet Routing Switch 4500 Series does not implement any form of automatic
configuration of IPv6 address in release 5.2.
ICMPv6
Internet Control Message Protocol (ICMP) version 6 maintains and improves upon features
from ICMP for IPv4. ICMPv6 reports the delivery of forwarding errors, such as destination
unreachable, packet too big, time exceeded, and parameter problem. ICMPv6 also delivers
information messages such as echo request and echo reply.
Important:
ICMPv6 plays an important role in IPv6 features such as neighbor discovery, Multicast
Listener Discovery, and path MTU discovery.
Neighbor discovery
IPv6 nodes (routers and hosts) on the same link use neighbor discovery (ND) to discover link
layer addresses and to obtain and advertise various network parameters and reachability
information. ND combines the services provided for IPv4 with the Address Resolution Protocol
(ARP) and router discovery. Neighbor discovery replaces ARP in IPv6.
Hosts use ND to discover the routers in the network that you can use as the default routers,
and to determine the link layer address of their neighbors attached on their local links. Routers
also use ND to discover their neighbors and their link layer information. Neighbor discovery
also updates the neighbor database with valid entries, invalid entries, and entries migrated to
different locations.
Neighbor discovery protocol provides you with the following:
• Address and prefix discovery: hosts determine the set of addresses that are on-link for
the given link. Nodes determine which addresses or prefixes are locally reachable or
remote with address and prefix discovery.
• Router discovery: hosts discover neighboring routers with router discovery. Hosts
establish neighbors as default packet-forwarding routers.
System configuration fundamentals
34 Configuration — System April 2011