Configuring Nat For Local Traffic Breakout Support - Cisco ASR 5000 Administration Manual

DHCP-based Enhanced Wireless Access Gateway Configuration
#To configure GTP-C parameters:
gtpc { bind address <ipv4_address> | dns-sgsn context <context_name> | echo-
interval <echo_interval_seconds> | echo-retransmission { exponential-backoff [ [ min-
timeout <min_retrans_timeout_seconds> ] [ smooth-factor <smooth_factor> ] + ] | timeout
<retrans_timeout_seconds> } | guard-interval <guard_interval_seconds> | ignore response-
port-validation | ip qos-dscp { af11 | af12 | af13 | af21 | af22 | af23 | af31 | af32 |
af33 | af41 | af42 | af43 | be | ef } | max-retransmissions <max_retransmissions> |
retransmission-timeout <retrans_timeout_seconds> | send { common flags | rab-context |
target-identification-preamble } }
#To configure GTP-U parameters:
gtpu { bind address <ipv4_address> | echo-interval <echo_interval_seconds> |
echo-retransmission { exponential-backoff [ [ min-timeout <min_retrans_timeout_seconds> ]
[ smooth-factor <smooth_factor> ] + ] | timeout <retrans_timeout_seconds> } | max-
retransmissions <max_retransmissions> | retransmission-timeout <retrans_timeout_seconds>
}
#To configure path failure detection policy:
path-failure detection-policy gtp { echo | non-echo } +
#To configure the restart counter change window to avoid service deactivations and
activations that could cause large bursts of network traffic if the restart counter
change messages from the GGSN are erroneous:
max-remote-restart-counter-change <variance>
end
Notes:
 The SGTP service must be associated in the D-eWAG service configuration.

Configuring NAT for Local Traffic Breakout Support

To configure NAT for Local Traffic Breakout support, use the following sample configuration:
configure
active-charging service ecs_service_name
fw-and-nat firewall_nat_policy_name
nat policy ipv4-only default-nat-realm nat_pool_default
access-rule priority 10 access-ruledef ruledef_1 permit nat-realm nat_pool_1
access-rule priority 15 access-ruledef ruledef_2 permit nat-realm nat_pool_2
access-rule priority 100 access-ruledef ruledef_3 permit nat-realm nat_pool_1
access-rule priority 105 access-ruledef ruledef_4 permit
Cisco ASR 5000 Enhanced Wireless Access Gateway Administration Guide ▄
D-eWAG Configuration ▀
105