Configuring ISG Port-Bundle Host Key
Prerequisites for the ISG Port-Bundle Host Key Feature
2
Prerequisites for the ISG Port-Bundle Host Key Feature
For information about release and platform requirements, see the
“Feature Information for ISG
Port-Bundle Host Key” section on page 9
.
The external portal must support port-bundle host keys and must be configured with the same
port-bundle host key parameters.
Restrictions for the ISG Port-Bundle Host Key Feature
The following restrictions apply to the ISG Port-Bundle Host Key feature:
•
The ISG Port-Bundle Host Key feature must be separately enabled at the portal and at all connected
ISGs.
•
All ISG source IP addresses configured with the source command must be routable in the
management network where the portal resides.
•
For each portal server, all connected ISGs must have the same port-bundle length.
•
The ISG Port-Bundle Host Key feature uses TCP. Packets will not be mapped for a subscriber who
is not sending TCP traffic.
•
Specifying the Port-Bundle Host Key feature in a user profile will work only when the user profile
is available prior to the arrival of IP packets; for example, for PPP sessions or for DHCP-initiated
IP sessions with transparent autologon.
Information About ISG Port-Bundle Host Key
Before you configure the ISG Port-Bundle Host Key feature, you should understand the following
concepts:
•
Overview of ISG Port-Bundle Host Key, page 2
•
Port-Bundle Host Key Mechanism, page 2
•
Benefits of ISG Port-Bundle Host Key, page 3
Overview of ISG Port-Bundle Host Key
The ISG Port-Bundle Host Key feature serves as an in-band signaling mechanism for session
identification at external portals. TCP packets from subscribers are mapped to a local IP address for the
ISG gateway and a range of ports. This mapping allows the portal to identify the ISG gateway from
which the session originated. The mapping also identifies sessions uniquely even when subscribers have
overlapping IP addresses. The ISG Port-Bundle Host Key feature enables a single portal to be deployed
for multiple VRFs even when there are subscribers with overlapping IP addresses.
Port-Bundle Host Key Mechanism
With the ISG Port-Bundle Host Key feature, an ISG performs Port-Address Translation (PAT) and
Network Address Translation (NAT) on the TCP traffic between the subscriber and the portal. When a
subscriber TCP connection is set up, the ISG creates a port mapping that changes the source IP address
Содержание IOS XE
Страница 14: ...About Cisco IOS XE Software Documentation Additional Resources and Documentation Feedback xii ...
Страница 28: ...Using the Command Line Interface in Cisco IOS XE Software Additional Information xiv ...
Страница 36: ...Intelligent Services Gateway Features Roadmap 8 ...
Страница 46: ...Overview of ISG Feature Information for the Overview of ISG 10 ...
Страница 70: ...Configuring ISG Control Policies Feature Information for ISG Control Policies 24 ...
Страница 128: ...Configuring ISG Access for IP Subscriber Sessions Feature Information for ISG Access for IP Subscriber Sessions 44 ...
Страница 136: ...Configuring MQC Support for IP Sessions Feature Information for MQC Support for IP Sessions 8 ...
Страница 194: ...Configuring ISG Policies for Automatic Subscriber Logon Feature Information for ISG Automatic Subscriber Logon 12 ...
Страница 224: ...Configuring ISG Subscriber Services Feature Information for ISG Subscriber Services 20 ...
Страница 336: ...Configuring ISG Integration with SCE Feature Information for Configuring ISG Integration with SCE 16 ...
Страница 344: ...Service Gateway Interface Feature Information for Service Gateway Interface 8 ...