Cisco Cisco Packet Data Gateway (PDG) Prospecto
Subscriber Configuration Mode Commands
▀ access-link ip-fragmentation
▄ Cisco ASR 5x00 Command Line Interface Reference
8206
access-link ip-fragmentation
Configures IP fragmentation processing over the Access-link.
Product
All
Privilege
Security Administrator, Administrator
Mode
Exec > Global Configuration > Context Configuration > Subscriber Configuration
configure > context context_name > subscriber { default | name subscriber_name }
Entering the above command sequence results in the following prompt:
[context_name]host_name(config-subscriber)#
Syntax
access-link ip-fragmentation { normal | df-ignore | df-fragment-and-icmp-notify }
df-ignore
Default: Enabled
Ignores the DF (Don’t Fragment) bit setting. Fragments and forwards the packet over the access link.
Ignores the DF (Don’t Fragment) bit setting. Fragments and forwards the packet over the access link.
df-fragment-and-icmp-notify
Default: Disabled
Partially ignores the DF bit. Fragments and forwards the packet, but also returns an ICMP error message to
the source of the packet. The number of ICMP errors sent like this is rate-limited to one ICMP error packet
per second per session.
Partially ignores the DF bit. Fragments and forwards the packet, but also returns an ICMP error message to
the source of the packet. The number of ICMP errors sent like this is rate-limited to one ICMP error packet
per second per session.
normal
Default: Disabled
Normal processing. Drops the packet and sends an ICMP unreachable message to the source of packet. This
is the default behavior.
Normal processing. Drops the packet and sends an ICMP unreachable message to the source of packet. This
is the default behavior.
Usage
If the IP packet to be forwarded is larger than the access-link MTU and if the DF (Don't Fragment) bit is set
for the packet, then the fragmentation behavior configured by this command is applied. Use this command to
fragment packets even if they are larger than the access-link MTU.
for the packet, then the fragmentation behavior configured by this command is applied. Use this command to
fragment packets even if they are larger than the access-link MTU.
Example
Set fragmentation so that the DF bit is ignored and the packet is forwarded anyway by entering the following
command:
command:
access-link ip-fragmentation df-ignore