Brocade Communications Systems ICX 7250 series, Configuration Manual

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• You cannot use IPv6 MTU to set Layer 2 maximum frame sizes per interface. Enabling global jumbo mode causes all
interfaces to accept Layer 2 frames.
Changing the IPv6 MTU
You can configure the IPv6 MTU on individual interfaces. For example, to configure the MTU on Ethernet interface 1/3/1 as 1280
bytes, enter the following commands.
device(config)# interface ethernet 1/3/1
device(config-if-e1000-1/3/1)# ipv6 mtu 1280
Syntax: [no] ipv6 mtu bytes
For bytes, specify a value between 1280 - 1500, or 1280 - 10218 if jumbo mode is enabled. If a non-default value is configured for
an interface, router advertisements include an MTU option.
NOTE
IPv6 MTU cannot be configured globally. It is supported only on devices running Layer 3
software.
Static neighbor entries configuration
In some special cases, a neighbor cannot be reached using the neighbor discovery feature. 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.)
NOTE
A port that has a statically assigned IPv6 entry cannot be added to a VLAN.
NOTE
Static neighbor configurations will be cleared on secondary ports when a LAG is
formed.
For example, to add a static entry for a neighbor with the IPv6 address 2001:DB8:2678:47b and link-layer address 0000.002b.8641
that is reachable through Ethernet interface 1/3/1, enter the ipv6 neighbor command.
device(config)# ipv6 neighbor 2001:DB8:2678:47b ethernet 1/3/1 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, specify the
port number of the Ethernet interface. 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.
Static neighbor entries configuration
Brocade FastIron Layer 3 Routing Configuration Guide
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