Operation Manual – IPv6 ManagementH3C S5100-SI/EI Series Ethernet Switches Chapter 1 IPv6 Configuration1-171.2.5 Configuring the Maximum Number of IPv6 ICMP Error Packets Sentwithin a Specified TimeIf too many IPv6 ICMP error packets are sent within a short time in a network, networkcongestion may occur. To avoid network congestion, you can control the maximumnumber of IPv6 ICMP error packets sent within a specified time. Currently, the tokenbucket algorithm is adopted.You can set the capacity of a token bucket, namely, the number of tokens in the bucket.In addition, you can set the update period of the token bucket, namely, the interval forupdating the number of tokens in the token bucket to the configured capacity. Onetoken allows one IPv6 ICMP error packet to be sent. Each time an IPv6 ICMP errorpacket is sent, the number of tokens in a token bucket decreases by 1. If the number ofthe IPv6 ICMP error packets that are continuously sent out reaches the capacity of thetoken bucket, the subsequent IPv6 ICMP error packets cannot be sent out until newtokens are put into the token bucket based on the specified update frequency.Follow these steps to configure the maximum number of IPv6 ICMP error packets sentwithin a specified time:To do… Use the command… RemarksEnter system view system-view —Configure themaximum number ofIPv6 ICMP errorpackets sent within aspecified timeipv6 icmp-error { bucketbucket-size | ratelimitinterval }*OptionalBy default, the capacity of atoken bucket is 10 and theupdate period to 100milliseconds. That is, at most 10IPv6 ICMP error packets can besent within an update period.1.2.6 Configuring the Hop Limit of ICMPv6 Reply PacketsWhen sending an ICMPv6 reply packet, the device will fill a configurable value in theHop Limit field in the ICMPv6 reply packet header.Follow these steps to configure the hop limit of ICMPv6 reply packets:To do… Use the command… RemarksEnter system view system-view —Configure the hop limit ofICMPv6 reply packets ipv6 nd hop-limit value Optional64 by default.
