User's Manual

Table Of Contents
529
Users Manual of CS-6306R
1. Setting the transmission frequency of the ICMPv6 packet
If you want to limit the transmission frequency of the ICMPv6 packet, run the command in the following table.
If the ICMPv6 transmission frequency is larger than the set value, the transmission frequency will be limited.
The default transmission frequency is 1000us. If you want to modify the transmission frequency, run the
following command in global mode:
Command Purpose
ipv6 icmp6-ratelimit ratelimit
Sets the transmission frequency of the ICMPv6 packet.
2. Setting the source IPv6 route
IPv6 allows a host to designate the route of an IPv6 network, that is, the source route. The host can realize
the source route through using the routing header in the IPv6 packets. The router can forward packets
according to the routing header, or desert this kind of packets considering security.
The router supports the source route by default. If the source route is closed, users can run the following
command in global configuration mode to open the source route.
Command Purpose
ipv6 source-route Allows the source IPv6 route.
3. Setting the MTU of IPv6
All interfaces have a default IPv6 MTU. If the length of an IPv6 packet exceeds MTU, the router will fragment
this IPv6 packet.
To set IPv6 MTU on a specific interface, run the following command in interface configuration mode:
Command Purpose
ipv6 mtu bytes
Sets IPv6 MTU on an interface.
4. Setting IPv6 redirection
Sometimes, the route selected by the host is not the best one. In this case, when a switch receives a packet
from this route, the switch will transmit, according to the routing table, the packet from the interface where the
packet is received, and forward it to another router which belongs to the same network segment with the host.
Under this condition, the switch will notify the source host of sending the packets with the same destination
address to another router directly, not by way of the switch itself. The redirection packet demands the source
host to replace the original route with the more direct route contained in the redirection packet. The operating
system of many hosts will add a host route to the routing table. However, the switch more trusts the
information getting from the routing protocol and so the host route will not be added according to this
information.
IPv6 redirection is opened by default. However, if a hot standby router protocol is configured on an interface,
IPv6 redirection is automatically closed. If the hot standby router protocol is canceled, this function will not
automatically opened.