194Step Command Remarks2. Configure the aging time fordynamic path MTUs. ipv6 pathmtu age age-time The default setting is 10 minutes.Controlling sending ICMPv6 packetsThis section describes how to configure ICMPv6 packet sending.Configuring the rate limit for ICMPv6 error messagesTo avoid sending excessive ICMPv6 error messages within a short period that might cause networkcongestion, you can limit the rate at which ICMPv6 error messages are sent. A token bucket algorithm isused with one token representing one ICMPv6 error message. Tokens are placed in the bucket at aspecific interval until the maximum number of tokens that the bucket can hold is reached. Tokens areremoved from the bucket when ICMPv6 error messages are sent. When the bucket is empty, ICMPv6error messages are not sent until a new token is placed in the bucket.To configure the rate limit for ICMPv6 error messages:Step Command Remarks1. Enter system view. system-view N/A2. Set the interval and bucket sizefor ICMPv6 error messagesipv6 icmpv6 error-intervalmilliseconds [ bucketsize ]By default, the bucket allows amaximum of 10 tokens, andtokens are placed in the bucketat the interval of 100milliseconds.To disable the ICMPv6 rate limit,set the interval to 0 milliseconds.Enabling replying to multicast echo requestsThe device does not respond to multicast echo requests by default. In some scenarios, however, you mustenable the device to answer multicast echo requests so the source host can obtain needed information.To enable the device to answer multicast echo requests:Step Command Remarks1. Enter system view. system-view N/A2. Enable replying to multicastecho requests.ipv6 icmpv6 multicast-echo-replyenableBy default, this function is notenabled.Enabling sending ICMPv6 destination unreachable messagesThe device sends ICMPv6 destination unreachable messages as follows:
