Cisco Cisco ASR 5000
Direct Tunnel
Direct Tunnel Configuration ▀
SGSN Administration Guide, StarOS Release 18 ▄
Black List : Disabled
GGSN Selection : Disabled
Direct Tunnel : Enabled
Verifying the RNC Configuration
Use the following command to display and verify the direct tunnel configuration in the RNC configuration:
show iups-service name <service_name>
The output of this command displays all of the configuration, including direct tunnel for the specified IuPS service.
IService name : iups1
...
Available RNC:
Rnc-Id : 1
Direct Tunnel : Not Restricted
Configuring S12 Direct Tunnel Support on the S-GW
The example in this section configures an S12 interface supporting direct tunnel bypass of the S4 SGSN for inter-RAT
handovers.
handovers.
The direct tunnel capability on the S-GW is enabled by configuring an S12 interface. The S4 SGSN is then responsible
for creating the direct tunnel by sending an FTEID in a control message to the MME over the S3 interface. The MME
forwards the FTEID to the S-GW over the S11 interfaces. The S-GW responds with it’s own U-FTEID providing the
SGSN with the identification information required to set up the direct tunnel over the S12 interface.
for creating the direct tunnel by sending an FTEID in a control message to the MME over the S3 interface. The MME
forwards the FTEID to the S-GW over the S11 interfaces. The S-GW responds with it’s own U-FTEID providing the
SGSN with the identification information required to set up the direct tunnel over the S12 interface.
Use the following example to configure this feature:
configure
context <egress_context_name> -noconfirm
interface <s12_interface_name>
ip address <s12_ipv4_address_primary>
ip address <s12_ipv4_address_secondary>
exit
exit
port ethernet <slot_number/port_number>
no shutdown
bind interface <s12_interface_name> <egress_context_name>