Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 485)

Multi-Service IronWare Routing Configuration Guide 457
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Configuring static neighbor entries
NOTE
If the size of a jumbo packet received on a port is equal to the maximum frame size of - 18 (Layer 2
MAC header + CRC) and if this value is greater than the IPv4/IPv6 MTU of the outgoing port, it will
be forwarded to the CPU.
How to determine the actual IPv6 MTU value
An IPv6 port can obtain an MTU value from any of the following sources:
• Default IP MTU setting
• Global MTU Setting
• Interface MTU Setting
An interface determines the actual MTU value through these processes.
1. If an IPv6 interface MTU value is configured, that value is used.
2. If an IPv6 interface MTU value is not configured and an IPv6 global MTU value is configured,
the configured global MTU value is used.
3. If neither an IPv6 interface MTU value or an IPv6 global MTU value are configured, the default
IPv6 MTU value of 1500 is used.
Configuring static neighbor entries
In some cases, a neighbor cannot be reached using neighbor discovery. In this situation, you can
add a static entry to the IPv6 neighbor discovery cache, which causes a neighbor to be reachable
at all times without using neighbor discovery. (A static entry in the IPv6 neighbor discovery cache
functions like a static ARP entry in IPv4.)
For example, to add a static entry for a neighbor with the IPv6 address 2001:DB8:2678::2 and
link-layer address 0000.002b.8641 that is reachable through Ethernet interface 3/1, enter the
following command.
Brocade(config)# ipv6 neighbor 2001:DB8:2678::2 ethernet 3/1 0000.002b.8641
Syntax: [no] ipv6 neighbor ipv6-address ethernet port | ve ve-number [ethernet port]
link-layer-address
The ipv6-address parameter specifies the address of the neighbor.
The ethernet | ve parameter specifies the interface through which to reach a neighbor. If you
specify an Ethernet interface, you must also specify the port number. If you specify a VE, specify the
VE number and then the Ethernet port numbers associated with the VE. The link-layer address is a
48-bit hardware address of the neighbor.
If you attempt to add an entry that already exists in the neighbor discovery cache, the software
changes the already existing entry to a static entry.
To remove a static IPv6 entry from the IPv6 neighbor discovery cache, use the no form of this
command.