Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 484)

456 Multi-Service IronWare Routing Configuration Guide
53-1003033-02
Changing the IPv6 MTU
Brocade(config)# interface ethernet 1/2
Brocade(config-if-e100-1/2)# ipv6 traffic-filter drop-access in
Brocade(config-if-e100-1/2)#exit
...
The IPv6 ACL “drop-access” must be bound to all other interfaces on the device.
By default, the device drops all IPv6 source-routed packets in hardware and software as described
in
“Complete filtering of IPv6 source-routed packets” on page 450. Use the ipv6 forward-source-
route and ipv6 source-route commands to enable forwarding of IPv6 source-routed packets.
Brocade(config)# ipv6 forward-source-route
Brocade(config)# ipv6 source-route
Changing the IPv6 MTU
The IPv6 MTU is the maximum length of an IPv6 packet that can be transmitted on a particular
interface. If an IPv6 packet is longer than an MTU, the host that originated the packet breaks the
packet into fragments and transmits the fragments in multiple packets that are shorter than the
configured MTU. You can configure the MTU on individual interfaces. Per RFC 2460, the minimum
IPv6 MTU for any interface is 1280 bytes.
NOTE
The maximum number of unique MTUs that can be configured on a Brocade NetIron CES or Brocade
NetIron CER device is 12.
To configure the MTU on interface 3/1 to 1280 bytes, enter the following commands.
Brocade(config)# interface ethernet 3/1
Brocade(config-if-e100-3/1)# ipv6 mtu 1280
Syntax: [no] ipv6 mtu bytes
You can specify between 1284 – (default-max-frame-size minus 18). If a non-default value is
configured for an interface, router advertisements include an MTU option. The minimum values you
can configure are: 1298 (IP6_MIN_MTU + 18) for Ethernet ports.
You can configure IPv6 MTU for to be greater than 1500 bytes, although the default remains at
1500 bytes.
At the global CLI level, use the ipv6 global-mtu command. To define IPv6 MTU globally, enter.
Brocade(config)#ipv6 global-mtu 1300
Syntax: [no] ipv6 global-mtu value
NOTE
After the configuration of ipv6 global-mtu, the system needs to be rebooted to enable the
management ethernet controller to reconfigure it.
To define IPv6 MTU on an interface, enter.
Brocade(config-if-e1000-2/1)#ipv6 mtu
Syntax: ipv6 mtu value