Cisco GRS User Manual

PurposeCommand or Action
Configures the adjustment MSS value as 1100 for the inside
VRF.
mss size
Example:
RP/0/RP0/CPU0:router(config-cgn-invrf-afi-proto)#
mss 1100
Step 6
Saves configuration changes.end or commit
Example:
RP/0/RP0/CPU0:router(config-cgn-invrf-proto)# end
or
Step 7
•
When you issue the end command, the system prompts
you to commit changes:
Uncommitted changes found, commit them before
exiting (yes/no/cancel)?
RP/0/RP0/CPU0:router(config-cgn-invrf-proto)#
commit
[cancel]:
◦
Entering yes saves configuration changes to the
running configuration file, exits the configuration
session, and returns the router to EXEC mode.
◦
Entering no exits the configuration session and
returns the router to EXEC mode without
committing the configuration changes.
◦
Entering cancel leaves the router in the current
configuration session without exiting or
committing the configuration changes.
•
Use the commit command to save the configuration
changes to the running configuration file and remain
within the configuration session.
Configuring the Refresh Direction for the Network Address Translation
Perform this task to configure the NAT mapping refresh direction as outbound for TCP and UDP traffic.
SUMMARY STEPS
1.
configure
2.
service cgn instance-name
3.
service-type nat44 nat1
4.
refresh-direction Outbound
5.
end or commit
Cisco IOS XR Carrier Grade NAT Configuration Guide for the Cisco CRS Router, Release 5.2.x
42 OL-32659-01
Implementing Carrier Grade NAT on Cisco IOS XR Software
Configuring the Policy Functions for the Carrier Grade NAT

Cisco GRS Specifications

General

Product Type	Router
Port Interfaces	Multiple 10GE, 40GE, and 100GE ports
Operating System	Cisco IOS XR
Redundancy	Yes
Power Supply	Dual or multiple power supplies

Summary

Preface

Changes to This Document

Lists technical changes made to the document since its first release.

Obtaining Documentation and Submitting a Service Request

Information on obtaining documentation, using Cisco Bug Search Tool, and submitting service requests.

New and Changed Carrier Grade NAT Feature Information

New and Changed Carrier Grade NAT Features

Lists features introduced or changed in Cisco IOS XR Carrier Grade NAT configuration.

Implementing Carrier Grade NAT on Cisco IOS XR Software

Carrier Grade NAT Overview and Benefits

Provides an overview of Carrier Grade NAT implementation and its advantages.

Information About Carrier Grade NAT

Details information about implementing NAT using ICMP and TCP protocols.

Cisco Carrier NAT Applications

Lists applications deployed on the CGSE line card for Carrier Grade NAT.

Policy Functions

Explains various policy functions related to Carrier Grade NAT.

Implementing Carrier Grade NAT on Cisco IOS XR Software

Details tasks to get started with CGN configuration.

Configuration Examples for Implementing the Carrier Grade NAT

Provides practical examples for configuring Carrier Grade NAT.

External Logging

Bulk Port Allocation

Allocates blocks of ports to reduce volume of log data generated by NAT sessions.

Session logging

Includes destination IP and port information in NAT translation records for Netflow or Syslog.

Syslog Logging

Configures Syslog logging for NAT table entries.

Frequently Asked Questions (FAQs)

Answers common questions about external logging features.