Cisco Cisco Packet Data Gateway (PDG)

policy

Configures the Mobile IPv6 policy to set the action to be taken when IPv4/IPv6 subscriber packets need to
be tunneled and the encapsulated packets exceed the tunnel maximum transmission unit (MTU).

Product

P-GW

SAEGW

Privilege

Security Administrator, Administrator

Command Modes

Exec > Global Configuration > Context Configuration > APN Configuration

configure > context context_name > apn apn_name

Entering the above command sequence results in the following prompt:

[

context_name

]

host_name

(config-apn)#

Syntax Description

policy ipv6 tunnel mtu exceed { fragment [ inner ] | notify-sender }
[ default | no ] policy ipv6 tunnel mtu exceed

default

IPv6: System will do a Path MTU (PMTU) discovery and send "ICMPv6 Packet Too Big" to the original
sender if the subscriber packet exceeds MTU after encapsulation.

IPv4: System will do an outer IPv6 fragmentation if the packet exceeds MTU after encapsulation.

Disables this functionality.

ipv6 tunnel mtu exceed { fragment [ inner ] | notify-sender }

fragment: System will do an outer IPv6 fragmentation if the subscriber packet exceeds MTU after
encapsulation.

inner:

IPv6: System will do a PMTU discovery and send "ICMPv6 Packet Too Big" to the original sender if the
subscriber packet exceeds MTU after encapsulation.

IPv4: If packet will exceed tunnel MTU after encapsulation, based on DF bit and ignore-df config, the original
IPv4 packet will be fragmented and then encapsulated so that it will not exceed MTU, or ICMP Error will be
sent if IPv4 packet fragmentation is not allowed.

Command Line Interface Reference, Modes A - B, StarOS Release 19

1691

APN Configuration Mode Commands

policy