H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – IPv6 Configuration
H3C S7500E Series Ethernet Switches Chapter 1 IPv6 Basics Configuration
1-19
To do… Use the command… Remarks
Configure the number of
attempts to send an NS
message for DAD
ipv6 nd dad attempts
value
Optional
1 by default. When the
value argument is set to 0,
DAD is disabled.
1.5 Configuring PMTU Discovery
1.5.1 Configuring a Static PMTU for a Specified IPv6 Address
You can configure a static PMTU for a specified destination IPv6 address. When a
source host sends packets through an interface, it compares the interface MTU with the
static PMTU of the specified destination IPv6 address. If the packet size is larger than
the smaller one between the two values, the host fragments the packet according to the
smaller value.
Follow these steps to configure a static PMTU for a specified address:
To do… Use the command… Remarks
Enter system view
system-view
—
Configure a static PMTU
for a specified IPv6
address
ipv6 pathmtu
ipv6-address [ value ]
Required
By default, no static
PMTU is configured.
1.5.2 Configuring the Aging Time for PMTU
After the MTU of the path from the source host to the destination host is dynamically
determined (refer to
IPv6 PMTU Discovery), the source host sends subsequent
packets to the destination host on basis of this MTU. After the aging time expires, the
dynamically determined PMTU is removed and the source host re-determines an MTU
to send packets through the PMTU mechanism.
The aging time is invalid for static PMTU.
Follow these steps to configure the aging time for PMTU:
To do… Use the command… Remarks
Enter system view
system-view
—
Configure aging time for
PMTU
ipv6 pathmtu age
age-time
Optional
10 minutes by default.