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Hop counts
About hop counts
Each search request is assigned a hop count value by the system that initiates the search. Every
time the request is forwarded to another neighbor gatekeeper or proxy, the hop count value is
decreased by a value of 1. When the hop count reaches 0, the request will not be forwarded on any
further and the search will fail.
For search requests initiated by the local VCS, the hop count assigned to the request is
configurable on a zone-by-zone basis. The zone's hop count applies to all search requests
originating from the local VCS that are sent to that zone.
Search requests received from another zone will already have a hop count assigned. When the
request is subsequently forwarded on to a neighbor zone, the lower of the two values (the original
hop count or the hop count configured for that zone) is used.
For H.323, the hop count only applies to search requests. For SIP, the hop count applies to all
requests sent to a zone, affecting the Max-Forwards field in the request.
The hop count value can be between 1 and 255.
The default is 15.
If your hop counts are set higher than necessary, you may risk introducing loops into your
!
network. In these situations a search request will be sent around the network until the hop
count reaches 0, consuming resources unnecessarily. This can be prevented by setting the
Call loop detection mode
to On.
When dialing by URI or ENUM, the hop count used is that for the associated DNS or ENUM
zone via which the destination endpoint (or intermediary SIP proxy or gatekeeper) was
found.
Overview and
System
Introduction
status
configuration
D14049.07
March 2010
VCS
Zones and
Clustering and
configuration
neighbors
peers
Configuring hop counts
Hop counts are configured on a zone basis. To configure the hop count for a zone:
1. Go to the Zones page.
VCS configuration > Zones
2. Click on the name of the zone you want to configure.
You are taken to the Edit zone page.
3. In the Configuration section, in the Hop Count field, enter the hop count value you want to use
for this zone.
To configure the hop count using the CLI:
•
xConfiguration Zones Zone [1..1000] HopCount
For full details on other zone options, see the
Call
Bandwidth
processing
control
87
TANDBERG
VIDEO COMMUNICATION SERVER
Zone configuration
section.
Firewall
Applications
Maintenance
traversal
ADMINISTRATOR GUIDE
Appendices
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