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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.
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 will apply 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 (i.e. the
original hop count or the hop count configured for that zone) will be 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
Introduction
Getting started
status
D14049.05
February 2009
System
VCS
Zones and
configuration
configuration
neighbors
Configuring hop counts
Hope counts are configured on a zone basis. To configure the hop count for a zone:
•
VCS configuration > Zones.
You will be taken to the
Zones
page.
Click on the name of the zone you wish to configure.
You will be taken to the
Edit zone
In the
Configuration
section, in the
this zone.
xConfiguration Zones Zone [1..200] HopCoun
•
For full details on other zone options, see
Call
Bandwidth
processing
control
94
TANDBERG
VIDEO COMMUNICATIONS SERVER
page.
Hop Count
field, enter the hop count value you wish to use for
t
Configuring
zones.
Firewall
Applications
Maintenance
traversal
ADMINISTRATOR GUIDE
Appendices
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