Cisco Cisco Packet Data Gateway (PDG) Veröffentlichungshinweis
ePDG Changes in Release 15.0
▀ ePDG Enhancements for September 30, 2013
▄ Cisco ASR 5x00 Release Change Reference
176
Previous Behavior: ePDG does support attempt of call establishment to alternate PGW FQDN when the previous
attempt PGW is not responding. In case the PGW has responded rejecting the call ePDG currently clears the call and
does not attempt to other PGW.
attempt PGW is not responding. In case the PGW has responded rejecting the call ePDG currently clears the call and
does not attempt to other PGW.
New Behavior: ePDG shall be attempting call establishment to other PGW in case the call is rejected with specific error
codes which may be due to resource limitations at PGW which is rejecting the call. This shall help in more successful
call establishment rate in network. ePDG needs to try an alternate PGW per the DNS response in case the first PGW has
rejected the call with below error causes.:
codes which may be due to resource limitations at PGW which is rejecting the call. This shall help in more successful
call establishment rate in network. ePDG needs to try an alternate PGW per the DNS response in case the first PGW has
rejected the call with below error causes.:
EGTP_CAUSE_ALL_DYNAMIC_ADDR_OCCUPIED (0x54)
EGTP_CAUSE_NO_RESOURCES_AVAILABLE(73)
EGTP_CAUSE_SERVICE_DENIED (0x59)
EGTP_CAUSE_PEER_NOT_RESPONDING-(100)
EGTP_CAUSE_SERVICE_NOT_SUPPORTED (0x44)
For all other (besides one mentioned above) GTP call reject cause the behavior shall be clearing the call when rejected
by PGW and not attempting on alternate PGWs.
by PGW and not attempting on alternate PGWs.
ePDG shall be having the handling for the above mentioned GTPv2 causes in similar manner to PGW not responding.
The disconnect reason shall also be same as PGW not reachable.
The disconnect reason shall also be same as PGW not reachable.
ePDG APN-NI: SWu (IDr) interworking with SWm (Service-Selection AVPAPN-NI+OI Support)
According to 3GPP TS 23.003 section 9.1, section 19.4 and TS 29.303 section 5.1.2, ePDG needs to be enhanced for
accepting the APN NI+OI received from UE in GPRS format.
accepting the APN NI+OI received from UE in GPRS format.
Previous Behavior: ePDG only supports APN-NI format being received on SWu interface and further communicate the
same over SWm and S2b interface. ePDG does not handles the OI part of APN.
same over SWm and S2b interface. ePDG does not handles the OI part of APN.
New Behavior: ePDG does support APN NI and also APN NI+OI formats of APN being received over SWu interface.
ePDG does extracts only APN-NI part and accordingly send the same over SWm interface. Over S2b interface ePDG
does sends APN NI+OI and the OI formation is done using the OI received over SWu interface or using the IMSI for
default OI creation.
ePDG does extracts only APN-NI part and accordingly send the same over SWm interface. Over S2b interface ePDG
does sends APN NI+OI and the OI formation is done using the OI received over SWu interface or using the IMSI for
default OI creation.
RFC 5996 Compliance
Support for processing TEMPORARY_FAILURE and CHILD-SA_NOT_FOUND has been added in accordance to the
RFC Specification.
RFC Specification.
During re key of IKE or CHILDSA, ePDG does not change parameters/algorithms for SA negotiation. Even in case it
has multiple transforms configured, it sends only the ones that were selected as part of initial negotiations i.e. IKE-SA-
INIT (for IKESA rekey) or IKE-AUTH (for CHILDSA rekey).
has multiple transforms configured, it sends only the ones that were selected as part of initial negotiations i.e. IKE-SA-
INIT (for IKESA rekey) or IKE-AUTH (for CHILDSA rekey).
UDP encapsulation for inbound packets is supported even for non-NAT'ed sessions.
Certificate exchange is supported using hash-and-url encoding as well. This reduces the size of IKE packet sent by
ePDG is ePDG is authenticating using Certificates.
ePDG is ePDG is authenticating using Certificates.
Modified ePDG Commands
This section identifies ePDG commands modified in release 15.0.
IKEv2 RFC 5996 Support - ePDG