H3C Technologies H3C S5560 Series Switches - Manual (Page 172)

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Step Command Remarks
3. Configure the interface MTU. ipv6 mtu mtu-size
By default, no interface MTU is
configured.
Configuring a static path MTU for an IPv6 address
You can configure a static path MTU for an IPv6 address. Before sending a packet to the IPv6 address,
the device compares the MTU of the output interface with the static path MTU. If the packet exceeds the
smaller one of the two values, the device fragments the packet according to the smaller value. After
sending the fragmented packets, the device dynamically finds the path MTU to a destination host (see
" IPv6 path MTU discovery ").
To configure a static path MTU for a destination IPv6 address:
Step Command Remarks
1. Enter system view. system-view N/A
2. Configure a static path MTU
for a destination IPv6 address.
ipv6 pathmtu [ vpn-instance
vpn-instance-name ] ipv6-address
value
By default, no path MTU is
configured for any IPv6 address.
Configuring the aging time for dynamic path MTUs
After the device dynamically finds the path MTU to a destination host (see " IPv6 path MTU discovery "),
it sends packets to the destination host based on the path MTU and starts an aging timer. When the
aging timer expires, the device removes the dynamic path MTU and finds the path MTU again.
The aging time is invalid for a static path MTU.
To configure the aging time for dynamic path MTUs:
Step Command Remarks
1. Enter system view. system-view N/A
2. Configure the aging time for
dynamic path MTUs.
ipv6 pathmtu age age-time The default setting is 10 minutes.
Controlling sending ICMPv6 messages
This section describes how to configure ICMPv6 message sending.
Configuring the rate limit for ICMPv6 error messages
To avoid sending excessive ICMPv6 error messages within a short period that might cause network
congestion, you can limit the rate at which ICMPv6 error messages are sent. A token bucket algorithm is
used with one token representing one ICMPv6 error message.
Tokens are placed in the bucket at intervals until the maximum number of tokens that the bucket can hold
is reached.