H3C S5120-EI Series User Manual

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MTU. After the aging time expires, the dynamic PMTU is removed and the source host re-determines a
dynamic path MTU through the PMTU mechanism.
The aging time is invalid for a static PMTU.
Follow these steps to configure the aging time for dynamic PMTUs:
To do… Use the command… Remarks
Enter system view
system-view
—
Configure the aging time for
dynamic PMTUs
ipv6 pathmtu age age-time
Optional
10 minutes by default.
Configuring IPv6 TCP Properties
The IPv6 TCP properties you can configure include:
z synwait timer: When a SYN packet is sent, the synwait timer is triggered. If no response packet is
received before the synwait timer expires, the IPv6 TCP connection establishment fails.
z finwait timer: When the IPv6 TCP connection status is FIN_WAIT_2, the finwait timer is triggered. If
no packet is received before the finwait timer expires, the IPv6 TCP connection is terminated. If a
FIN packet is received, the IPv6 TCP connection status becomes TIME_WAIT. If non-FIN packets
are received, the finwait timer is reset upon receipt of the last non-FIN packet and the connection is
terminated after the finwait timer expires.
z Size of the IPv6 TCP sending/receiving buffer.
Follow these steps to configure IPv6 TCP properties:
To do… Use the command… Remarks
Enter system view
system-view
—
Set the finwait timer
tcp ipv6 timer fin-timeout
wait-time
Optional
675 seconds by default.
Set the synwait timer
tcp ipv6 timer syn-timeout
wait-time
Optional
75 seconds by default.
Set the size of the IPv6 TCP
sending/receiving buffer
tcp ipv6 window size
Optional
8 KB by default.
Configuring ICMPv6 Packet Sending
Configuring the Maximum ICMPv6 Error Packets Sent in an Interval
If too many ICMPv6 error packets are sent within a short time in a network, network congestion may
occur. To avoid network congestion, you can control the maximum number of ICMPv6 error packets
sent within a specified time, currently by adopting the token bucket algorithm.
You can set the capacity of a token bucket, namely, the number of tokens in the bucket. In addition, you
can set the update interval of the token bucket, namely, the interval for restoring the configured capacity.
One token allows one ICMPv6 error packet to be sent. Each time an ICMPv6 error packet is sent, the
number of tokens in a token bucket decreases by one. If the number of ICMPv6 error packets

H3C S5120-EI Series Specifications

General

Brand	H3C
Model	S5120-EI Series
Category	Switch
Language	English