Cisco GRS User Manual

• Endpoint-independent mapping—Reuses the port mapping for subsequent packets that are sent from
the same internal IP address and port to any external IP address and port.
• Address-dependent mapping—Reuses the port mapping for subsequent packets that are sent from the
same internal IP address and port to the same external IP address, regardless of the external port.
CGN on ISM implements Endpoint-Independent Mapping.Note
Translation Filtering
RFC 4787 provides translation filtering behaviors for NATs. These options are used by NAT to filter packets
originating from specific external endpoints:
• Endpoint-independent filtering—Filters out only packets that are not destined to the internal address
and port regardless of the external IP address and port source.
• Address-dependent filtering—Filters out packets that are not destined to the internal address. In
addition, NAT filters out packets that are destined for the internal endpoint.
• Address and port-dependent filtering—Filters out packets that are not destined to the internal address.
In addition, NAT filets out packets that are destined for the internal endpoint if the packets were not
sent previously.
Prerequisites for Implementing the Carrier Grade NAT
The following prerequisites are required to implement Carrier Grade NAT:
•
You must be running Cisco IOS XR software Release 3.9.1 or above.
•
You must have installed the CGN service package or the pie hfr-services-p.pie-x.x.x or
hfr-services-px.pie-x.x.x (where x.x.x specifies the release number of Cisco IOS XR software)
The CGN service package was termed as hfr-cgn-p.pie or hfr-cgn-px.pie for releases
prior to Cisco IOS XR Software Release 4.2.0. The CGN service package is referred as
hfr-services-p.pie or hfr-services-px.pie in Cisco IOS XR Software Release 4.2.0 and
later.
Note
•
You must be in a user group associated with a task group that includes the proper task IDs. The command
reference guides include the task IDs required for each command.
•
In case of Intra chassis redundancy, enable CGSE data and control path monitoring in configuration
mode, where R/S/CPU0 is the CGSE Location -
•
service-plim-ha location is R/S/CPU0 datapath-test
•
service-plim-ha location is R/S/CPU0 core-to-core-test
•
service-plim-ha location is R/S/CPU0 pci-test
Cisco IOS XR Carrier Grade NAT Configuration Guide for the Cisco CRS Router, Release 5.2.x
OL-32659-01 5
Implementing Carrier Grade NAT on Cisco IOS XR Software
Prerequisites for Implementing the Carrier Grade NAT

Cisco GRS Specifications

General

Brand	Cisco
Model	GRS
Category	Network Router
Language	English