Cisco GRS

CONTENTS
Preface Preface ix
Changes to This Document ix
Obtaining Documentation and Submitting a Service Request ix
CHAPTER 1 New and Changed Carrier Grade NAT Feature Information 1
New and Changed Carrier Grade NAT Features 1
CHAPTER 2 Implementing Carrier Grade NAT on Cisco IOS XR Software 3
Carrier Grade NAT Overview and Benefits 3
Carrier Grade NAT Overview 3
Benefits of Carrier Grade NAT 4
IPv4 Address Shortage 4
NAT and NAPT Overview 4
Network Address and Port Mapping 4
Translation Filtering 5
Prerequisites for Implementing the Carrier Grade NAT 5
CGSE PLIM 6
CGSE Multi-Chassis Support 7
CGSE Plus PLIM 7
Information About Carrier Grade NAT 7
Implementing NAT with ICMP 7
ICMP Query Session Timeout 7
Implementing NAT with TCP 8
Address and Port Mapping Behavior 8
Internally Initiated Connections 8
Externally Initiated Connections 8
Implementing NAT 44 over ISM 8
Cisco IOS XR Carrier Grade NAT Configuration Guide for the Cisco CRS Router, Release 5.2.x
OL-32659-01 iii