H3C MSR Series Command Reference

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Default
The DF bit is not configured for the outer IP header of IPsec packets on an interface. The global DF
bit setting is used.
Views
Interface view
Predefined user roles
network-admin
Parameters
clear: Clears the DF bit in the outer IP header. IPsec packets can be fragmented.
copy: Copies the DF bit setting of the original IP header to the outer IP header.
set: Sets the DF bit in the outer IP header. IPsec packets cannot be fragmented.
Usage guidelines
This command is effective only when the IPsec encapsulation mode is tunnel mode. It is not effective
in transport mode because the outer IP header is not added in transport mode.
This command does not change the DF bit for the original IP header of IPsec packets.
If multiple interfaces use an IPsec policy that is bound to a source interface, you must use the same
DF bit setting on these interfaces.
Packet fragmentation and reassembly might cause packet forwarding to be delayed. You can set the
DF bit to avoid the forwarding delay. However, to prevent the IPsec packets from being discarded,
you must make sure the path MTU is larger than the IPsec packet size. As a best practice, clear the
DF bit if you cannot make sure the path MTU is larger than the IPsec packet size.
Examples
# Set the DF bit in the outer IP header of IPsec packets on GigabitEthernet1/0/2.
<Sysname> system-view
[Sysname] interface gigabitethernet 1/0/2
[Sysname-GigabitEthernet1/0/2] ipsec df-bit set
Related commands
ipsec global-df-bit
ipsec fragmentation
Use ipsec fragmentation to configure the IPsec fragmentation feature.
Use undo ipsec fragmentation to restore the default.
Syntax
ipsec fragmentation { after-encryption | before-encryption }
undo ipsec fragmentation
Default
The device fragments packets before IPsec encapsulation.
Views
System view
Predefined user roles
network-admin

H3C MSR Series Specifications

General

Category	Network Router
IPv6 Support	Yes
Dimensions	Varies by model
Weight	Varies by model
Product Type	Modular Router
Ports	Varies by model
WAN Interfaces	Varies by model
Firewall	Yes
QoS	Yes
Wireless Support	Varies by model
USB Ports	Varies by model
Console Port	Yes
Power Supply	Varies by model
Redundancy	Varies by model
Operating Temperature	0°C to 45°C
Storage Temperature	-40°C to 70°C
Humidity	5% to 95% non-condensing
Series	MSR
Certifications	CE, FCC, RoHS