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Use undo ipv6 mtu to restore the default MTU.
Syntax
ipv6 mtu size
undo ipv6 mtu
Default
No MTU is configured for an interface.
Views
Interface view
Predefined user roles
network-admin
Parameters
size: Specifies the size of the MTUs of an interface in bytes. The value range for this argument is
1280 to 9008.
Usage guidelines
IPv6 routers do not support packet fragmentation. After an IPv6 router receives an IPv6 packet, if the
packet size is greater than the MTU of the forwarding interface, the router discards the packet.
Meanwhile, the router sends the MTU to the source host through an ICMPv6 packet — Packet Too
Big message. The source host fragments the packet according to the MTU and resends it. To reduce
the extra flow overhead resulting from packet drops, set an appropriate interface MTU for your
network.
Examples
# Set the MTU of IPv6 packets sent over VLAN-interface 100 to 1280 bytes.
<Sysname> system-view
[Sysname] interface vlan-interface 100
[Sysname-Vlan-interface100] ipv6 mtu 1280
ipv6 nd autoconfig managed-address-flag
Use ipv6 nd autoconfig managed-address-flag to set the managed address configuration flag (M)
to 1 in RA advertisements to be sent.
Use undo ipv6 nd autoconfig managed-address-flag to restore the default.
Syntax
ipv6 nd autoconfig managed-address-flag
undo ipv6 nd autoconfig managed-address-flag
Default
The M flag is set to 0 in RA advertisements. Hosts receiving the advertisements will obtain IPv6
addresses through stateless autoconfiguration.
Views
Interface view
Predefined user roles
network-admin
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