1-18Configuring the Maximum Number of IPv6 ICMP Error Packets Sent within aSpecified TimeIf too many IPv6 ICMP error packets are sent within a short time in a network, network congestion mayoccur. To avoid network congestion, you can control the maximum number of IPv6 ICMP error packetssent within a specified time. Currently, the token bucket algorithm is adopted.You can set the capacity of a token bucket, namely, the number of tokens in the bucket. In addition, youcan set the update period of the token bucket, namely, the interval for updating the number of tokens inthe token bucket to the configured capacity. One token allows one IPv6 ICMP error packet to be sent.Each time an IPv6 ICMP error packet is sent, the number of tokens in a token bucket decreases by 1. Ifthe number of the 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 new tokens are put intothe token bucket based on the specified update frequency.Table 1-13 Configure the maximum number of IPv6 ICMP error packets sent within a specified timeTo do… Use the command… RemarksEnter system view system-view —Configure the maximumnumber of IPv6 ICMP errorpackets sent within a specifiedtimeipv6 icmp-error { bucketbucket-size | ratelimitinterval }*OptionalBy default, the capacity of a token bucket is10 and the update period to 100milliseconds. That is, at most 10 IPv6 ICMPerror packets can be sent within an updateperiod.Configuring the Hop Limit of ICMPv6 Reply PacketsWhen sending an ICMPv6 reply packet, the device will fill a configurable value in the Hop Limit field inthe ICMPv6 reply packet header.Table 1-14 Configure the hop limit of ICMPv6 reply packetsTo do… Use the command… RemarksEnter system view system-view —Configure the hop limit of ICMPv6reply packets ipv6 nd hop-limit value Optional64 by default.Configuring ND SnoopingAmong the S3100 series Ethernet switches, only the S3100-EI series support ND Snooping.
