From the automation perspective, the RIPE conference is a dream come true – 30 seconds after you upload your presentation, it appears on the RIPE web site, it’s automatically updated on the podium computer, and the video recording of your talk is published before you even manage to get off the podium – so you can already watch my “SDN - 4 years later (aka Quo Vadis, SDN?)” presentation if you missed it yesterday.
The implementation of redundancy in any technology is of paramount importance, whether you’re studying to achieve a CCIE certification or designing a network for a client. So it goes without saying that this is a concept with which you should become intimately familiar.
In this blog, we’ll turn our focus specifically to redundancy in IOS dial-peers
. Of course, dial-peers
come in two different flavors: POTS and VoIP. POTS dial-peers
deal exclusively with PSTN connectivity while VoIP dial-peers can be used for several purposes, as long as the communication takes place over IP.
Let’s take the example of a call routed inbound from the PSTN, destined toward the HQ CUCM cluster using the H.323 protocol. The configuration on the gateway appears as shown below.
As you can see, we are accepting calls inbound from the PSTN using dial-peer voice 1 pots
and translating the incoming called number to a 4-digit DN. From there, we have two separate dial-peers
with the ability to send the call to the HQ CUCM cluster. As you know, the dial-peer
with the lowest preference (default 0) is chosen as the first routing option. If for some reason, that option is unavailable, the next possible dial-peer
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Report predicts deployments in 12 months.