Cisco Cisco ASR 5500 Guía Para Resolver Problemas
During the initial Attach and PDN connection creation with 3rd Generation Partnership Project (3GPP)
access, both a PGW and an SGW must be selected by the MME.
access, both a PGW and an SGW must be selected by the MME.
The service parameter that is used in the S−NAPTR procedure for the PGW is either x−3gpp−pgw:x−s5−gtp
or x−3gpp−pgw:x−s5−pmip.
or x−3gpp−pgw:x−s5−pmip.
You must provision the authoritative DNS server that is responsible for the
apn.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org domain with NAPTR records for each Access Point
Name−FQDN (APN−FQDN) value in the network. The NAPTR records are formed from these service
parameters and all of the S5/S8 interfaces:
apn.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org domain with NAPTR records for each Access Point
Name−FQDN (APN−FQDN) value in the network. The NAPTR records are formed from these service
parameters and all of the S5/S8 interfaces:
x−3gpp−pgw:x−s8−gtp
•
x−3gpp−pgw:x−s8−pmip
•
x−3gpp−pgw:x−s5−gtp
•
x−3gpp−pgw:x−s5−pmip
•
The APN−FQDN is used in DNS queries by the MME and is derived from an APN. The DNS and S−NAPTR
procedures logically output a list of host names that are each coupled with a service, a protocol, a port, and a
list of IPv4 and/or IPv6 addresses. This is the candidate list of the PGWs for a specific APN. This candidate
list is passed through the selection logic in order to choose a specific PGW. The selection logic can use
parameters such as:
procedures logically output a list of host names that are each coupled with a service, a protocol, a port, and a
list of IPv4 and/or IPv6 addresses. This is the candidate list of the PGWs for a specific APN. This candidate
list is passed through the selection logic in order to choose a specific PGW. The selection logic can use
parameters such as:
Load (locally deduced)
•
Order, preference, and weight (DNS provided)
•
Collocation with the SGW (learned from DNS responses)
•
Topological closeness
•
Note: Once the PGW has successfully been contacted, the selected PGW host name, the used PGW IP
address, the port number, and the selected protocol type is stored in the MME per PDN.
address, the port number, and the selected protocol type is stored in the MME per PDN.
APN−FQDN
The APN is received by the Evolved Packet Core (EPC) node discovery function for 3GPP accesses and has
two parts: the APN Network Identifier (NI) and the APN Operator Identifier (OI).
two parts: the APN Network Identifier (NI) and the APN Operator Identifier (OI).