CISCO-EPC-GATEWAY-MIB
AI MIB Summary
The CISCO-EPC-GATEWAY-MIB provides management interfaces for Cisco Evolved Packet Core (EPC) nodes, specifically the PDN Gateway (PGW) and Serving Gateway (SGW), to monitor GTP-based bearer sessions, control plane signaling states, and user plane traffic flows. It enables the tracking of critical operational metrics including dynamic congestion thresholds (DFP), per-bearer buffering status, and resource utilization (CPU/memory) to enforce policy enforcement, charging rules, and overload protection mechanisms.
This MIB module manages the features and configuration for PDN Gateway(PGW) and Serving Gateway(SGW) in Evolved Packet Core(EPC) architecture.
The PGW is the permanent IP point-of-attachment for access via the E-UTRAN. The PGW performs IP policy and charging enforcement on packet flows to and from mobile devices.
The SGW is a local mobility anchor for E-UTRAN mobility, switching packets between the S5 interface and the GTP based S1-U interface for mobiles in connected mode.
++
| | | | | +=======+__________ | | | UTRAN | |S12 | | | +======+ | | | +======| | | | | +======| SGSN |___ | | | | +======+ || | | | GERAN | | S4|| | | +=======+ |(GTP-C|| | | S3| VO,V1|| | | | GTPU|| | | |VO,V1)|| | | +======+ || | | ____| MME |__ || | | | +======+ ||| | | S1-MME| S11 ||| | | | GTP-C ||| | | | (V0,V1,V2) ||| | |+====+ +========+ +======+ +======+ | +===+ || UE |-|E-Utran | | SGW | | PGW |-SGi-|PDN| || | |(EnodeB)| | | | | | | | |+====+ +========+ +======+ +======+ | +===+ | | | | GTP-C | | | | | |(vo,v1,v2)| | | | | |GTP-C | | | | | | (vo,v1) | | | | GTP v2-u | | | | | | (S1-U) S5 | | |
++
This architecture supports the non-roaming and roaming architectures using GTP based protocol on the PGW and SGW with a number of functions. It support high number of subscribers with their associated control messages and data traffic. Each of this association forms an entry in PGW and SGW and is commonly know as bearers.
The various features used by this architecture and their attributes are captured in this MIB:
1. Overload protection, handles congestion control, SGW and
PGW represent congestion as a DFP metric considering the current CPU, memory usage and number of bearers open. On reaching the low congestion threshold, based on the ARP, high priority calls are accepted and those with a lower priority are rejected. Once the high threshold is reached all new calls are rejected.
2. Buffering agent, the SGW buffers the data packets in the
downlink direction till the downlink path/peer information is ready. It buffers all packets coming from any gateway based on the default/configured values of the buffer size, discard period and number of packets. Packets will be buffered on a per bearer basis and retrieved in the order it was buffered using the handle given by the buffering agent initially. If the buffer is full then no more bearers will be accepted.
Acronyms and terms:
3GPP 3rd Generation Partnership Project DFP Dynamic Feedback Protocol EDGE Enhanced Data rates for GSM Evolution EPC Evolved Packet Core E-UTRAN Evolved UTRAN GERAN GSM EDGE Radio Access Network GPRS General Packet Radio Service GSM Global System for Mobile communications GTP GPRS Tunneling Protocol PDN Public Data Network PGW PDN Gateway SAE System Architecture Evolution SGW Serving Gateway SP GW An integrated SGW and PGW Gateway UE User Equipment UMTS Universal Mobile Telecommunications System UTRAN UMTS Radio Access Network
REFERENCE
[1] 3GPP: Evolved GPRS Tunneling Protocol for Control Plane (GTPv2-C). 3GPP TS 29.274 V1.3.1.
[2] 3GPP: GPRS enhancements for E-UTRAN access. 3GPP TS 23.401 V8.3.0.
[3] 3GPP: Circuit Switched fallback in Evolved Packet System(EPS). 3GPP TS 23.272.
Main OID:
ciscoEpcGatewayMIB.1.3.6.1.4.1.9.9.731
68
Objects
Active
Status
5
Dependencies
Imported Objects
Objects
68 total| Object Name |
|---|
ciscoEpcGatewayMIBThis MIB module manages the features and configuration
for PDN Gateway(PGW) and Serving Gateway(SGW) in Evolved
Packet Core(EPC) architecture.
The PGW is the permanent IP point-of-attachment for
access via the E-UTRAN. The PGW performs IP policy and
charging enforcement on packet flows to and from mobile
devices.
The SGW is a local mobility anchor for E-UTRAN mobility,
switching packets between the S5 interface and the GTP
based S1-U interface for mobiles in connected mode.
++
| |
| |
| +=======+__________ |
| | UTRAN | |S12 |
| | +======+ | |
| +======| | | |
| +======| SGSN |___ | |
| | +======+ || |
| | GERAN | | S4|| |
| +=======+ |(GTP-C|| |
| S3| VO,V1|| |
| | GTPU|| |
| |VO,V1)|| |
| +======+ || |
| ____| MME |__ || |
| | +======+ ||| |
| S1-MME| S11 ||| |
| | GTP-C ||| |
| | (V0,V1,V2) ||| |
|+====+ +========+ +======+ +======+ | +===+
|| UE |-|E-Utran | | SGW | | PGW |-SGi-|PDN|
|| | |(EnodeB)| | | | | | | |
|+====+ +========+ +======+ +======+ | +===+
| | | | GTP-C | |
| | | |(vo,v1,v2)| |
| | | |GTP-C | |
| | | | (vo,v1) | |
| | GTP v2-u | | | |
|
| (S1-U) S5 |
| |
++
This architecture supports the non-roaming and roaming
architectures using GTP based protocol on the PGW and SGW
with a number of functions. It support high number of
subscribers with their associated control messages and
data traffic. Each of this association forms an entry in
PGW and SGW and is commonly know as bearers.
The various features used by this architecture and their
attributes are captured in this MIB:
1. Overload protection, handles congestion control, SGW and
PGW represent congestion as a DFP metric considering the
current CPU, memory usage and number of bearers open. On
reaching the low congestion threshold, based on the ARP, high
priority calls are accepted and those with a lower priority
are rejected. Once the high threshold is reached all new
calls are rejected.
2. Buffering agent, the SGW buffers the data packets in the
downlink direction till the downlink path/peer information is
ready. It buffers all packets coming from any gateway based
on the default/configured values of the buffer size, discard
period and number of packets. Packets will be buffered on a
per bearer basis and retrieved in the order it was buffered
using the handle given by the buffering agent initially. If
the buffer is full then no more bearers will be accepted.
Acronyms and terms:
3GPP 3rd Generation Partnership Project
DFP Dynamic Feedback Protocol
EDGE Enhanced Data rates for GSM Evolution
EPC Evolved Packet Core
E-UTRAN Evolved UTRAN
GERAN GSM EDGE Radio Access Network
GPRS General Packet Radio Service
GSM Global System for Mobile communications
GTP GPRS Tunneling Protocol
PDN Public Data Network
PGW PDN Gateway
SAE System Architecture Evolution
SGW Serving Gateway
SP GW An integrated SGW and PGW Gateway
UE User Equipment
UMTS Universal Mobile Telecommunications System
UTRAN UMTS Radio Access Network
REFERENCE
[1] 3GPP: Evolved GPRS Tunneling Protocol for Control
Plane (GTPv2-C). 3GPP TS 29.274 V1.3.1.
[2] 3GPP: GPRS enhancements for E-UTRAN access.
3GPP TS 23.401 V8.3.0.
[3] 3GPP: Circuit Switched fallback in Evolved
Packet System(EPS). 3GPP TS 23.272. MODULE-IDENTITY .1.3.6.1.4.1.9.9.731 |
ciscoEpcGatewayMIBNotifications OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.731.0 |
cegCongestionHighThresholdNotifThis notification will be sent when
the gateway congestion level goes above
cegCongestionHighThreshold value.
This gives an indication that the gateway
is running at high congestion and at this
state it would reject all new calls. NOTIFICATION-TYPE .1.3.6.1.4.1.9.9.731.0.1 |
cegCongestionLowThresholdNotifThis notification will be sent when
the gateway congestion level goes above
cegCongestionLowThreshold value.
This gives an indication that the gateway
is running at low congestion at this
state it can accept only the high priority
calls and those with a lower priority would
be rejected. NOTIFICATION-TYPE .1.3.6.1.4.1.9.9.731.0.2 |
cegCongestionClearedNotifThis notification will be sent when
the gateway congestion level goes below
cegCongestionLowThreshold value.
This gives an indication that the gateway
has recovered from congestion and it can
accept all calls. NOTIFICATION-TYPE .1.3.6.1.4.1.9.9.731.0.3 |
ciscoEpcGatewayMIBObjects OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.731.1 |
ciscoEpcGatewayStatistics OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.731.1.1 |
cegOverloadProtectionStats OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.731.1.1.1 |
cegCongestionIncomingReqDropsThis object represents the total number of
incoming calls dropped at the gateway.
This counter is incremented when the gateway
receives an incoming call request at high
congestion level, and the request is dropped.ro Counter32 .1.3.6.1.4.1.9.9.731.1.1.1.1 |
cegCongestionLowThresholdReachedThis object represents the number of times
low congestion occurred on the gateway.
The value is equal to the number of times
the gateway exceeded the congestion threshold
cegCongestionLowThreshold.ro Counter32 .1.3.6.1.4.1.9.9.731.1.1.1.2 |
cegCongestionHighThresholdReachedThis object represents the number of times
high congestion occurred on the gateway.
The value is equal to the number of times
the gateway exceeded the congestion threshold
cegCongestionHighThreshold.ro Counter32 .1.3.6.1.4.1.9.9.731.1.1.1.3 |
cegBufferStats OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.731.1.1.2 |
cegBuffersCreatedThis object represents the total number of
buffers allocated by buffering agent.ro Counter32 UNITS "buffer" .1.3.6.1.4.1.9.9.731.1.1.2.1 |
cegBuffersDeletedThis object represents the total number of
buffers deallocated by buffering agent.ro Counter32 UNITS "buffer" .1.3.6.1.4.1.9.9.731.1.1.2.2 |
cegBuffersTimedOutThis object represents the total number of
buffers that got timed out, at buffering agent.
A buffer is timed out when the discard timer
cegBufferDiscardDataTime expires.ro Counter32 .1.3.6.1.4.1.9.9.731.1.1.2.3 |
cegBufferPacketsEnqueuedThis object represents the total number of
packets enqueued to the buffering agent.ro Counter32 UNITS "packet" .1.3.6.1.4.1.9.9.731.1.1.2.4 |
cegBufferPacketsDequeuedThis object represents the total number of
packets dequeued from the buffering agent.ro Counter32 UNITS "packet" .1.3.6.1.4.1.9.9.731.1.1.2.5 |
cegBufferBytesEnqueuedThis object represents the total bytes of
data enqueued to the buffering agent.ro Counter32 UNITS "Bytes" .1.3.6.1.4.1.9.9.731.1.1.2.6 |
cegBufferBytesDequeuedThis object represents the total bytes of
data dequeued from the buffering agent.ro Counter32 UNITS "Bytes" .1.3.6.1.4.1.9.9.731.1.1.2.7 |
cegBufferRejMemUnavailableThis object represents the total number of times, buffer
allocation is rejected by gateway due to, requested memory
is greater than cegTotalBufferAvailable.ro Counter32 .1.3.6.1.4.1.9.9.731.1.1.2.8 |
cegBufferRejLowMemThis object represents the total number of times, buffer
allocation is rejected due to, low memory availability in
the gateway.ro Counter32 .1.3.6.1.4.1.9.9.731.1.1.2.9 |
cegPacketDropDueToMaxPacketLimitThis object represents the number of packet drops due to bearer
maximum packet limit.ro Counter32 .1.3.6.1.4.1.9.9.731.1.1.2.10 |
cegPacketDropDueToMaxBufferLimitThis object represents the number of packet drops due to bearer
maximum buffer limit.ro Counter32 .1.3.6.1.4.1.9.9.731.1.1.2.11 |
ciscoEpcGatewayConfig OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.731.1.2 |
cegOverloadProtectionConfig OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.731.1.2.1 |
cegCongestionLowThresholdThis object specifies the low threshold
for congestion. Congestion DFP metric
considers the current CPU memory usage
and number of bearers open. On reaching
the low congestion threshold, based on the
ARP, high priority calls are accepted and
those with a lower priority are rejected.rw Unsigned32 .1.3.6.1.4.1.9.9.731.1.2.1.1 |
cegCongestionHighThresholdThis object specifies the high threshold
for congestion. Congestion DFP metric
considers the current CPU memory usage
and number of bearers open. Once the
high threshold is reached all new calls
are rejected.rw Unsigned32 .1.3.6.1.4.1.9.9.731.1.2.1.2 |
cegBufferingAgentConfig OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.731.1.2.2 |
cegBufferingAgentEnabledThis object specifies the state of
the buffering agent.
'true' - indicates that the buffering agent
is enabled.
'false' - indicates that the buffering agent
is disabled.rw TruthValue (SNMPv2-TC) .1.3.6.1.4.1.9.9.731.1.2.2.1 |
cegBufferMaxSizeThis object represents the maximum size of a
buffer that can be allocated for a bearer.
This object is directly dependent on object
cegBufferingAgentEnabled and is applicable
only when buffering agent is enabled, that is
when cegBufferingAgentEnabled is 'true'.rw Unsigned32 .1.3.6.1.4.1.9.9.731.1.2.2.2 |
cegBufferDiscardDataTimeThis object specifies the duration for which
the buffering agent waits before discarding a
buffer.
The discard timer begins when a packet is
enqueued in the allocated buffer for a bearer.
Whenever a packet is enqueued for a bearer, the
discard timer is reset. If the timer expires,
then the buffer is freed.rw Unsigned32 .1.3.6.1.4.1.9.9.731.1.2.2.3 |
cegBufferMaxPacketsPerBufferThis object specifies the maximum
number of packets allowed per buffer in
buffering agent.
Any new incoming packet after this
value has reached its maximum will be
dropped.rw Unsigned32 .1.3.6.1.4.1.9.9.731.1.2.2.4 |
ciscoEpcGatewayStatus OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.731.1.3 |
cegVersionThis object represents the current
version of the PGW or SGW software
running on the gateway.
Display format:
<software> : <version>:<release>.ro SnmpAdminString .1.3.6.1.4.1.9.9.731.1.3.1 |
cegActivatedIpv4BearersThis object represents the total
activated IPv4 GTPv2 bearers.ro Gauge32 UNITS "bearer" .1.3.6.1.4.1.9.9.731.1.3.2 |
cegActivatedIpv6BearersThis object represents the total
activated IPv6 GTPv2 bearers.ro Gauge32 UNITS "bearer" .1.3.6.1.4.1.9.9.731.1.3.3 |
cegTotalUsersThis object represents the total number of
users connected to the gateway.ro Gauge32 .1.3.6.1.4.1.9.9.731.1.3.4 |
cegTotalIdleUsersThis object represents the total number of users
currently in ISR state in the gateway.ro Gauge32 UNITS "Users" .1.3.6.1.4.1.9.9.731.1.3.5 |
cegTotalSuspendedUsersThis object represents the total number of users
suspended by the gateway.
A user would be suspended when E-UTRAN coverage is
overlapped by either GERAN or UTRAN coverage leading
to a Circuit Switch fallback from E-UTRAN. The Circuit
Switch fallback enables reuse of voice and other Circuit
Switch services by reuse of the Circuit Switch
infrastructure.ro Gauge32 .1.3.6.1.4.1.9.9.731.1.3.6 |
cegActivatedIpv4v6SessionsThis object represents the total number of activated
IPv4v6 sessions.ro Gauge32 UNITS "sessions" .1.3.6.1.4.1.9.9.731.1.3.7 |
cegOverloadProtectionStatus OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.731.1.3.8 |
cegCongestionDfpWeightThis object represents the DFP weight value, which
is the measure of the load on CPU in the gateway.ro Unsigned32 .1.3.6.1.4.1.9.9.731.1.3.8.1 |
cegCongestionStatusThis object represents the gateway congestion
status.
normal - The gateway is not in a congestion state.
At this state, the value of cegCongestionDfpWeight
is less than value of cegCongestionLowThreshold.
low - The gateway is running in low congestion state.
At this state, the value of cegCongestionDfpWeight
is more than value of cegCongestionLowThreshold but
less than value of cegCongestionHighThreshold.
high - The gateway is running in high congestion state.
At this state, the value of cegCongestionDfpWeight
is more than value of cegCongestionHighThreshold.ro Enumeration .1.3.6.1.4.1.9.9.731.1.3.8.2 |
cegCongestionLowLastOccurTimeThis object represents the timestamp at
which low congestion last occurred on the
gateway.ro TimeStamp (SNMPv2-TC) .1.3.6.1.4.1.9.9.731.1.3.8.3 |
cegCongestionLowLastDurationThis object represents the duration of
last low congestion.ro TimeInterval (SNMPv2-TC) .1.3.6.1.4.1.9.9.731.1.3.8.4 |
cegCongestionHighLastOccurTimeThis object represents the timestamp at
which high congestion last occurred on the
gateway.ro TimeStamp (SNMPv2-TC) .1.3.6.1.4.1.9.9.731.1.3.8.5 |
cegCongestionHighLastDurationThis object represents the duration of
the last high congestion.ro TimeInterval (SNMPv2-TC) .1.3.6.1.4.1.9.9.731.1.3.8.6 |
cegBufferStatus OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.731.1.3.9 |
cegTotalInUseBuffersThis object represents the total
number of buffers currently allocated
for the bearers, by buffering agents.ro Gauge32 UNITS "buffer" .1.3.6.1.4.1.9.9.731.1.3.9.1 |
cegTotalBufferedPacketsThis object represents the total
number of packets buffered at present
in the buffers of buffering agents.ro Gauge32 UNITS "packet" .1.3.6.1.4.1.9.9.731.1.3.9.2 |
cegTotalBufferedBytesThis object represents the total
number of bytes buffered at present
in the buffers of buffering agents.ro Gauge32 UNITS "Bytes" .1.3.6.1.4.1.9.9.731.1.3.9.3 |
cegTotalBufferAvailableThis object represents the total
unallocated bytes at buffering agents.ro Gauge32 UNITS "Bytes" .1.3.6.1.4.1.9.9.731.1.3.9.4 |
cegActivatedIpv4v6BearersThis object represents the total number of activated
IPv4v6 bearers.ro Gauge32 UNITS "bearers" .1.3.6.1.4.1.9.9.731.1.3.10 |
cegActivatedGtpv2SgwSessionsThis object represents the total number of activated
GTPV2 sessions in SGW mode.ro Gauge32 UNITS "sessions" .1.3.6.1.4.1.9.9.731.1.3.11 |
cegActivatedGtpv2PgwSessionsThis object represents the total number of activated
GTPV2 sessions in PGW mode.ro Gauge32 UNITS "sessions" .1.3.6.1.4.1.9.9.731.1.3.12 |
cegActivatedGtpv2SPgwSessionsThis object represents the total number of activated
GTPV2 sessions in SP GW mode.ro Gauge32 UNITS "sessions" .1.3.6.1.4.1.9.9.731.1.3.13 |
cegActivatedBearersThis object represents the total number of default and
dedicated bearers currently active in the Gateway.ro Gauge32 UNITS "Bearers" .1.3.6.1.4.1.9.9.731.1.3.14 |
cegActivatedDedicatedBearersThis object represents the total number of
dedicated bearers currently active in the Gateway.ro Gauge32 UNITS "Bearers" .1.3.6.1.4.1.9.9.731.1.3.15 |
cegActivatedIpv4DedicatedBearersThis object represents the total number of IPv4
dedicated bearers currently active in the Gateway.ro Gauge32 UNITS "Bearers" .1.3.6.1.4.1.9.9.731.1.3.16 |
cegActivatedIpv6DedicatedBearersThis object represents the total number of IPv6
dedicated bearers currently active in the Gateway.ro Gauge32 UNITS "Bearers" .1.3.6.1.4.1.9.9.731.1.3.17 |
cegTotalIdleSessionsThis object represents the total number of sessions
currently in Idle state in the gateway.ro Gauge32 UNITS "Sessions" .1.3.6.1.4.1.9.9.731.1.3.18 |
ciscoEpcGatewayNotifMgmt OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.731.1.4 |
cegCongestionHighNotifEnableThe object controls the generation of
cegCongestionHighThresholdNotif as follows:
'true(1)' - the generation of cegCongestionHighThresholdNotif
notifications is enabled.
'false(2)' - the generation of cegCongestionHighThresholdNotif
notifications is disabled.rw TruthValue (SNMPv2-TC) .1.3.6.1.4.1.9.9.731.1.4.1 |
cegCongestionLowNotifEnableThe object controls the generation of
cegCongestionLowThresholdNotif as follows:
'true(1)' - the generation of cegCongestionLowThresholdNotif
notifications is enabled.
'false(2)' - the generation of cegCongestionLowThresholdNotif
notifications is disabled.rw TruthValue (SNMPv2-TC) .1.3.6.1.4.1.9.9.731.1.4.2 |
cegCongestionClearNotifEnableThe object controls the generation of
cegCongestionClearedNotif as follows:
'true(1)' - the generation of cegCongestionClearedNotif
notifications is enabled.
'false(2)' - the generation of cegCongestionClearedNotif
notifications is disabled.rw TruthValue (SNMPv2-TC) .1.3.6.1.4.1.9.9.731.1.4.3 |
ciscoEpcGatewayMIBConformance OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.731.3 |
ciscoEpcGatewayMIBCompliances OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.731.3.1 |
ciscoEpcGatewayMIBGroups OBJECT IDENTIFIER .1.3.6.1.4.1.9.9.731.3.2 |