Configure the GPRS
Tunneling Protocol Control (GTP-C) settings for the SGTP service.
Product:
MME
PDG/TTG
SGSN
Privilege:
Security Administrator,
Administrator
Syntax
gtpc { bind
address ipv4_address | dns-sgsn
context context_name | echo-interval
interval_seconds | guard-interval interval_seconds | ignore response-port-validation | ip
qos-dscp dscp_marking | max-retransmissions max_retransmissions | retransmission-timeout timeout_seconds | send { common
flags | rab-context | target-identification-preamble } }
no gtpc { bind
address | dns-sgsn context | echo-interval | send { common-flags | rab-context | target-identification-preamble } }
default gtpc { echo-interval | guard-interval | ignore response-port-validation | ip
qos-dscp | max-retransmissions | retransmission-timeout | send { common-flags | rab-context | target-identification-preamble } }
no
Disables the configured
GTP-C setting.
default
Resets the specified
parameter to its default value.
bind address ipv4_address
Binds SGTP service
to the IP address of the interface.
The bind address for
the gtpc and gtpu commands
should be the same.
ipv4_address must
be a standard IPv4 address.
dns-sgsn context context_name
Enter a string of
1 to 79 alphanumeric characters to identify the context.
echo-interval interval_seconds
Configures the duration
between echoes.
seconds Enter
an integer from 0 through 3600.
Default: 60
echo-retransmission { exponential-backoff [ [ min-timeout timeout_seconds ] [ smooth-factor smooth_factor ] + ] | timeout timeout_seconds }
Configures the retransmission
parameters for GTP-C echo messages. The operator can choose to
use either an “exponential-backoff” timers or
a “fixed-retransmission” timer:
- The exponential-backoff timer
uses an exponential backoff algorithm to better manage the GTP-C
path during periods of network congestion and to perform exponential-backoff
echo timing. The exponential-backoff timer uses a calculated round-trip
time (RTT), as well as a configurable factor or a multiplier to
be applied to the RTT statistic. Different paths can each have a
different RTT, so the exponential-backoff timer can be configured
for multiple paths. One or both of the following parameters can
be configured to refine the exponential-backoff timer configuration:
- min-timeout timeout_seconds:
Specifies the minimum time period (in seconds) for the exponential-backoff
echo timer. If the RTT multiplied by the smooth factor is less than
this minimum timeout value, then the node uses the value set with this
keyword. Range is 1-20. Default is 5.
- smooth-factor smooth_factor:
Specifies the multiplier that the exponential-backoff echo timer
uses when calculating the time to wait to send retries, when the
gateway has not received a response from the peer within value defined
for the path echo interval. Range is 1-5. Default is 2.
- timeout timeout_seconds:
Configures the number of seconds for the fixed retransmission timeout
value for GTP-C echo messages. Range from 1 to 20. Default is 5.
guard-interval interval_seconds
Configures the interval
(in seconds) for which the SGTP maintains responses sent to gateway.
This optimizes the handling of retransmitted messages. This value
should be configured to be greater than the gateway's configuration
for max-retries multiple by retry-interval.
interval_seconds:
Enter an integer from 10 to 3600.
Default: 100
ignore response-port-validation
This keyword instructs
the gateway to ignore the response port validation.
For the gateway to
process incoming GTP responses to an incorrect port,
this keyword must be entered, and the same bind address must
be configured for GTPC and GTPU in the SGTP service.
Default: Disabled.
To reset the default for this parameter, you must enter the following command: no gtpc ignore response-port-validation.
ip qos-dscp dscp_marking
Configures the diffserv
code point marking to be used when sending GTP-C messages originating
from the session manager and SGTPC manager.
dscp_marking:
Enter one of the following values:
- af11: Marks traffic
as Assured Forwarding 11 PHB (high throughput data)
- af12: Marks traffic
as Assured Forwarding 12 PHB (high throughput data)
- af13: Marks traffic
as Assured Forwarding 13 PHB (high throughput data)
- af21: Marks traffic
as Assured Forwarding 21 PHB (low latency data)
- af22: Marks traffic
as Assured Forwarding 22 PHB (low latency data)
- af23: Marks traffic
as Assured Forwarding 23 PHB (low latency data)
- af31: Marks traffic
as Assured Forwarding 31 PHB (multimedia streaming)
- af32: Marks traffic
as Assured Forwarding 32 PHB (multimedia streaming)
- af33: Marks traffic
as Assured Forwarding 33 PHB (multimedia streaming)
- af41: Marks traffic
as Assured Forwarding 41 PHB (multimedia conferencing).
- af42: Marks traffic
as Assured Forwarding 42 PHB (multimedia conferencing)
- af43: Marks traffic
as Assured Forwarding 43 PHB (multimedia conferencing)
- be : Designates
use of Best Effort forwarding PHB. This is the default value.
- ef : Designates
use of Expedited Forwarding PHB
Default: be (best effort)
max-retransmissions max_retransmissions
Configures the maximum
number of retries for packets.
max_retransmissions:
Enter an integer from 0 to 15.
Default: 4
retransmission-timeout timeout_seconds
Configures the control
packet retransmission timeout in GTP, in seconds.
timeout_seconds:
Enter an integer value from 1 through 20.
Default: 5
send { common-flags | rab-context | target-identification-preamble }
- common-flags :
This option configures the SGTP service to include or exclude the
common flags IE during an Inter-SGSN RAU. When selected, the default
is to send the common flags IE.
IMPORTANT:
Sending of common flags
must be enabled to configure dual PDP type (IPv4v6) addressing with
the dual-address-pdp command
in the SGSN global configuration mode.
- rab-context :
This option configures the SGTP service to include/exclude
the radio access bearer (RAB) context IE in SGSN ‘context response’ message
during Inter-SGSN Routing Area Update procedure. Default is to send
the RAB context IE.
- target-identification-preamble :
This option configures the SGTP service to include the Target Identification
IE preamble byte in the target-id of Relocation Requests that it
sends. By default, the preamble is not included. In accordance with 3GPP
TS 29.060, v9.2.0, if the preamble is included then multiple optional
parameters, such as Extended RNC ID, are encoded. Extended RNC ID
expands the ID range from 4095 to 65535.In situations of MME
interaction with the SGSN during SRNS procedures via GTPv1, the SGSN
can use this Extended RNC ID field to indicate the Target RNC ID
associated with the MME and vice versa.
Default: sending RAB
context IE.
Usage:
Use this command to
configure GTP-C settings for the current SGTP service. Repeat the command
as needed to configure all required GTP-C parameters.
Example:
Following command
excludes the radio access bearer (RAB) context IE in the SGSN Context
Response message during the inter-SGSN RAU procedure:
no gtpc send rab-context
Configure the SGSN
to send
common
flags with all GTP-C messages:
gtpc send common-flags
Set the SGSN to use GTPC
echo-retransmission with exponential-backoff and both filters set
for default:
gtpc echo-retransmission
exponential-backoff