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New Member

Cisco Alternate GK Redundancy Problem!!!

I have two VoIP Gateways (AS5300):

GW1: 192.168.2.1

GW2: 192.168.3.1

and two Gatekeepers (Rtr 3660):

GK: 192.168.2.2 (primary GK)

Atl_GK: 192.168.3.2 (alternate GK)

I want to use Alternate Gatekeepers solution for fault tolerance as Cisco Recommendation so I have defined as follow:

GW1:

interface FastEthernet0

ip address 192.168.2.1 255.255.255.0

h323-gateway voip interface

h323-gateway voip id VTI_ZONE ipaddr 192.168.2.2 1718 priority 100

h323-gateway voip id VTI_ZONE_BACK ipaddr 192.168.3.2 1718

h323-gateway voip h323-id VTI-HAN_5300_1

h323-gateway voip tech-prefix 3#

GW2:

interface FastEthernet0

ip address 192.168.3.1 255.255.255.0

h323-gateway voip interface

h323-gateway voip id VTI_ZONE ipaddr 192.168.2.2 1718 priority 100

h323-gateway voip id VTI_ZONE_BACK ipaddr 192.168.3.2 1718

h323-gateway voip h323-id VTI-HAN_5300_2

h323-gateway voip tech-prefix 3#

GK (primary GK):

gatekeeper

zone local VTI_ZONE VoIP 192.168.2.2

zone remote VTI_ZONE_BACK VoIP 192.168.3.2 1719

zone prefix VTI_ZONE 84* gw-priority 10 VTI-HAN_5300_1 VTI-HAN_5300_2

zone prefix VTI_ZONE_BACK 84* ! To solve zone fragment problem

Atl_GK (alternate GK):

gatekeeper

zone local VTI_ZONE_BACK VoIP 192.168.3.2

zone remote VTI_ZONE VoIP 192.168.2.2 1719

zone prefix VTI_ZONE_BACK 84* gw-priority 10 VTI-HAN_5300_1 VTI-HAN_5300_2

zone prefix VTI_ZONE 84* ! To solve zone fragment problem

I want to share voice traffic with both GW1 and GW2 because one GW is not enough for our traffic and overload happens. In normal case both GW1 and GW2 register to a primary GK or to a alternate GK and traffic will be terminated in both GWs, it is OK.

But at any given time, GW1 may be registered to its primary GK and GW2 may be registered to its alternate Atl_GK (zone fragment problem). In this case all the calls had dialed number begin with 84 will be routed to GW1 by primary GK because GW2 is registered to alternate GK not primary GK. If there are a lot of calls GW1 will be out of resource and it send RAI message to primary GK (primary GK will ignore this RAI msg because there is only one GW register to it), please tell me primary GK can route other calls to alternate GK to share voice traffic with GW2 or not? If primary GK still route more calls to GW1 and GW1 become overload how can i solve this problem? Can Dynamic Alternate GK (GK Cluster) solve this problem?

  • Other Collaboration Voice and Video Subjects
4 REPLIES
New Member

Re: Cisco Alternate GK Redundancy Problem!!!

Hi,

I may be wrong but I think the only way to have redundant GK in the same GW is through HSRP. In your case, you can load share using two different HSRP group (2 VLAN) ... one GW pointing to group 1 and the second GW pointing to group 2.

New Member

Re: Cisco Alternate GK Redundancy Problem!!!

Thanks poulin,

HSRP is only recommended for Directory GK not GK. Cisco TAC told me that GK Cluster can solve my problem but they do not give me documents about GK Cluster in detail so I am not sure. Any documents or answers about GK Cluster would be appreciated.

Cisco Employee

Re: Cisco Alternate GK Redundancy Problem!!!

New Member

Re: Cisco Alternate GK Redundancy Problem!!!

Thanks,

I have read this kind of documents many times but... it is really general document. As you know, configuring GK Cluster is very easy but how does it work? Any one from Cisco can tell me about how H225 Ras message will be sent to members of remote Cluster (sequential or blast), how local GK will round robin LRQs between members to resolve one zone prefix....

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