Configuring A Static Path Mtu For An Ipv6 Address; Configuring The Aging Time For Dynamic Path Mtus; Controlling Sending Icmpv6 Messages; Configuring The Rate Limit For Icmpv6 Error Messages - HP FlexNetwork MSR2003 Configuration Manual

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
To configure a static path MTU for a destination IPv6 address:
Step
1. Enter system view.
2. Configure a static path MTU
for a destination IPv6
address.

Configuring the aging time for dynamic path MTUs

After the device dynamically finds the path MTU to a destination host (see
discovery"), it performs the following tasks:
•
Sends packets to the destination host based on the path MTU.
•
Starts the aging timer.
When the aging timer expires, the device removes the dynamic path MTU and finds the path MTU
again.
To configure the aging time for dynamic path MTUs:
Step
1. Enter system view.
2. Configure the aging time for
dynamic path MTUs.

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.
A token is placed in the bucket at intervals until the maximum number of tokens that the bucket can
hold is reached.
A token is removed from the bucket when an ICMPv6 error message is sent. When the bucket is
empty, ICMPv6 error messages are not sent until a new token is placed in the bucket.
To configure the rate limit for ICMPv6 error messages:
"IPv6 path MTU discovery").
Command
system-view
ipv6 pathmtu [ vpn-instance
vpn-instance-name ] ipv6-address
value
Command
system-view
ipv6 pathmtu age age-time
223
Remarks
N/A
By default, no path MTU is
configured for any IPv6 address.
"IPv6 path MTU
Remarks
N/A
The default setting is 10 minutes.
The aging time is invalid for a
static path MTU.