39-6
Cisco Catalyst Blade Switch 3120 for HP Software Configuration Guide
OL-12247-01
Chapter 39 Configuring IPv6 Unicast Routing
Understanding IPv6
The switch uses hardware memory to store unicast routes, MAC addresses, access control lists (ACLs),
and other features, and provides the switch database management (SDM) templates to allocate memory
resources depending on how the switch is used. You must use the dual IPv4 and IPv6 template templates
to allocate hardware memory usage to both IPv4and IPv6 protocols. See the
“SDM Templates” section
on page 39-11
.
EIGRP IPv6
Enhanced Interior Gateway Routing Protocol (EIGRP) IPv6 is supported. The IPv6 commands duplicate
the functionality of their counterpart commands for IPv4. EIGRP IPv6 can be configured directly onto
the interfaces on which it runs and therefore does not require a global IPv6 address.
This example below shows the minimal configuration required for EIGRP IPv6:
!
ipv6 unicast-routing enable IPv6 packet forwarding
!
interface e0
ipv6 enable enable IPv6 on the interface (or configure global address)
ipv6 eigrp 1 enable EIGRP IPv6 for AS 1 (Nvgen’s router process)
no shutdown
!
ipv6 router eigrp 1 router process for AS 1
router-id 1.1.1.1 A explicit router id on this IPv6-only node
no shutdown process is not shutdown
The above configuration allows you to send hellos to establish adjacencies (on Ethernet 0), however, to
do so, it must also meet the following conditions:
•
IPv6 unicast packet forwarding is enabled.
•
IPv6 is enabled by issuing the ipv6 enable command on the interface or on a global IPv6 address.
•
The interface has its line protocol running.
•
The router process is running.
•
The router process has a router ID.
EIGRP IPv6 can be configured on an interface. However, after being configured on an interface, it can
start running before any of the EIGRP IPv6 router-mode commands have been executed. This is
undesired, therefore, by default, EIGRP Ipv6 is in shutdown state. After you configure the router and
interface for EIGRP IPv6, then you can issue the no shutdown command to start the protocol. This
ensures that all router-mode configurations are executed before the protocol is started.
Prefix Lists
Use the distribute-list prefix-list command to define which networks running EIGRP IPv6 are to
receive routing updates. The route-map command is not supported for route filtering with a distributed
list.
Router ID
An instance of EIGRP IPv6 requires that you have a router ID before it can run. As with IPv4, EIGRP
IPv6 supports implicit and explicit router IDs. An implicit router ID is derived from a local IPv4 address,
so any IPv4 node always has an available router ID. However, EIGRP IPv6 might be running in a network
with only IPv6 nodes and therefore might not have an available IPv4 router ID. You can use the show
ipv6 eigrp command to see whether a router ID has been configured, and you can use the router-id
command to set an explicit router ID.
