Cisco Cisco Expressway
Configuring Expressway to use an external
policy server
policy server
Configuring Call Policy to use an external service
To configure Call Policy to refer all policy decisions out to an external service:
1. Go to
Configuration > Call policy > Configuration
.
2. Select a Call Policy mode of Policy service.
3. Configure the fields that are presented as follows:
Protocol
The protocol used to connect to the policy
service.
service.
The default is HTTPS.
The Expressway automatically supports
HTTP to HTTPS redirection when
communicating with the policy service
server.
HTTP to HTTPS redirection when
communicating with the policy service
server.
Certificate
verification
mode
verification
mode
When connecting over HTTPS, this setting
controls whether the certificate presented by
the policy server is verified.
controls whether the certificate presented by
the policy server is verified.
If On, for the Expressway to connect to a policy
server over HTTPS, the Expressway must have
a root CA certificate loaded that authorizes that
server’s server certificate. Also the certificate's
Subject Common Name or Subject Alternative
Name must match one of the Server address
fields below.
server over HTTPS, the Expressway must have
a root CA certificate loaded that authorizes that
server’s server certificate. Also the certificate's
Subject Common Name or Subject Alternative
Name must match one of the Server address
fields below.
The Expressway’s root CA certificates are
loaded via (
loaded via (
Maintenance > Security
certificates > Trusted CA certificate
).
HTTPS
certificate
revocation list
(CRL)
checking
certificate
revocation list
(CRL)
checking
Enable this option if you want to protect
certificate checking using CRLs and you have
manually loaded CRL files, or you have
enabled automatic CRL updates.
certificate checking using CRLs and you have
manually loaded CRL files, or you have
enabled automatic CRL updates.
Go to
Maintenance > Security
certificates > CRL management
to
configure how the Expressway uploads
CRL files.
CRL files.
Server
address 1 - 3
address 1 - 3
Enter the IP address or Fully Qualified Domain
Name (FQDN) of the server hosting the service.
You can specify a port by appending :<port>
to the address.
Name (FQDN) of the server hosting the service.
You can specify a port by appending :<port>
to the address.
If an FQDN is specified, ensure that the
Expressway has an appropriate DNS
configuration that allows the FQDN to be
resolved.
Expressway has an appropriate DNS
configuration that allows the FQDN to be
resolved.
For resiliency, up to three server
addresses can be supplied.
addresses can be supplied.
Path
Enter the URL of the service on the server.
Status path
The Status path identifies the path from where
the Expressway can obtain the status of the
remote service.
the Expressway can obtain the status of the
remote service.
The default is status.
The policy server must supply return status
information, see
information, see
Username
The username used by the Expressway to log in
and query the service.
and query the service.
Password
The password used by the Expressway to log in
and query the service.
and query the service.
The maximum plaintext length is 30
characters (which is subsequently
encrypted).
characters (which is subsequently
encrypted).
External Policy on Cisco Expressway Deployment Guide (X8.1)
Page 4 of 21
Configuring Expressway to use an external policy server