H3C Technologies H3C S10500 Series Switches - Manual (Page 129)

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Configuring the aging time for dynamic PMTUs
After the path MTU from a source host to a destination host is dynamically determined (see “ IPv6 PMTU
discovery ”), the source host sends subsequent packets to the destination host based on this 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
You can configure the following IPv6 TCP properties.
• 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.
• 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.
• 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 synwait timer
tcp ipv6 timer syn-timeout
wait-time Optional
75 seconds by default.
Set the finwait timer tcp ipv6 timer fin-timeout wait-time
Optional
675 seconds by default.
Set the size of the IPv6 TCP
sending/receiving buffer
tcp ipv6 window size
Optional
8 KB by default.