Cisco Cisco ASR 5000
Call Control Profile Configuration Mode
gw-selection ▀
Command Line Interface Reference, StarOS Release 18 ▄
1991
Usage
Use this command to define the criteria for gateway selection.
Selection of a co-located gateway (GW) node or a topologically closer GW node is based on string
comparison of canonical node names included in two or more sets of records received in DNS S-NAPTR
query result. For comparison, the canonical node names are derived from the hostnames received in the DNS
records. The hostnames must adhere to the following format:
Selection of a co-located gateway (GW) node or a topologically closer GW node is based on string
comparison of canonical node names included in two or more sets of records received in DNS S-NAPTR
query result. For comparison, the canonical node names are derived from the hostnames received in the DNS
records. The hostnames must adhere to the following format:
<topon|topoff>.<single-label-interface-name>.<canonical-node-name>;
Where “topon” or “topoff” is a prefix of the hostname and indicates whether or not the canonical node name
can be used for topology matching.
The table below lists the behaviors with various CLI options:
can be used for topology matching.
The table below lists the behaviors with various CLI options:
Table 23. CLI Behavior Options
Option
Keyword
Selected
Selected
Prefix in
Hostname
Hostname
Topological
Match Nodes
Match Nodes
Selected
Comments
1
co-location
topon
Yes
Co-located nodes are selected if available as they are listed before
topologically closer nodes in the DNS records.
topologically closer nodes in the DNS records.
2
co-location
topoff
Yes
Co-located nodes are selected if available as they are listed before
topologically closer nodes in the DNS records.
topologically closer nodes in the DNS records.
3
topology
topon
Yes
Co-located nodes are selected if available as they are listed before
topologically closer nodes in the DNS records.
topologically closer nodes in the DNS records.
4
topology
topoff
No
Nodes with prefix 'topoff' are ignored for topological matching
purposes. If no nodes are present with 'topon' as prefix then nodes are
selected independently based on Order/Priority mentioned in DNS
Records.
purposes. If no nodes are present with 'topon' as prefix then nodes are
selected independently based on Order/Priority mentioned in DNS
Records.
5
co-location
neither
Yes
Will strip only the first label from hostname to fetch canonical node
name for topology matching. Co-located nodes are selected if available
as they are listed before topologically closer nodes in the DNS records.
name for topology matching. Co-located nodes are selected if available
as they are listed before topologically closer nodes in the DNS records.
6
topology
neither
No
No co-located node pair listing; topologically closer node listing used
if available (Same behavior as defined for (4).
if available (Same behavior as defined for (4).
Example
The following command instructs the MME or SGSN to determine gateway selection on the basis of
topology:
topology:
gw-selection topology