Cisco Cisco ASR 5700 トラブルシューティングガイド
PGW and SGW Selection by MME Mechanism on
the ASR
the ASR
Document ID: 119015
Contributed by Krishna Kishore DV, Cisco TAC Engineer.
Jun 18, 2015
Jun 18, 2015
Contents
Introduction
Resource Records
A and AAAA
NAPTR
SRV
PGW Selection
APN−FQDN
APN Lookup for Simple LTE (PGW Candidate List)
SGW Selection
TAI−FQDN
TAI Lookup for Simple LTE (SGW Candidate List)
ASR5x00 Configurations
S5/S8 Protocol
DNS
CC Profile
MME Service
Sample DNS Client Configuration
GW Selection Criteria
Additional Configurations
Useful Troubleshooting Commands
Resource Records
A and AAAA
NAPTR
SRV
PGW Selection
APN−FQDN
APN Lookup for Simple LTE (PGW Candidate List)
SGW Selection
TAI−FQDN
TAI Lookup for Simple LTE (SGW Candidate List)
ASR5x00 Configurations
S5/S8 Protocol
DNS
CC Profile
MME Service
Sample DNS Client Configuration
GW Selection Criteria
Additional Configurations
Useful Troubleshooting Commands
Related Information
Introduction
This document describes the way in which the Mobility Management Entity (MME) mechanism is used in
order to select Packet Gateways (PGWs) and Serving Gateway (SGWs), and how it is implemented on the
Cisco 5x00 Series Aggregated Service Router (ASR5x00).
order to select Packet Gateways (PGWs) and Serving Gateway (SGWs), and how it is implemented on the
Cisco 5x00 Series Aggregated Service Router (ASR5x00).
Resource Records
This section describes the various resource records that are used by the MME.
A and AAAA
The A resource record is used in order to define the Internet Protocol Version 4 (IPv4) host addresses that
correspond to the Fully Qualified Domain Name (FQDN) of the host. The AAAA resource record is used in
order to define the Internet Protocol Version 6 (IPv6) host addresses that correspond to the FQDN of the host.
correspond to the Fully Qualified Domain Name (FQDN) of the host. The AAAA resource record is used in
order to define the Internet Protocol Version 6 (IPv6) host addresses that correspond to the FQDN of the host.
Here is an example: