Dual POP Dual last mile Dual CE (DPDLDC)
This is second post related to fail over Mechanism ,In first post we have configured IP SLA to track the Primary link.Here we won’t be configuring track but will be having IBGP configured between CPE-1 and CPE-2. It’s topology is also Dual POP Dual last mile Dual CE (DPDLDC).It provides redundancy both for WAN connectivity as well as LAN connectivity.
Here we will be controlling the Traffic from CPE. ISP is very much transparent and is not influencing traffic in this scenario.

Topology.
Here we wont’t track the WAN IP as in fail over Mechanism in last post but will have IBGP running between CPE-1 and CPE-2
Failover Mechanism —
1. Outgoing Traffic from CPE wan is controlled using Local-Preference (Higher LP preferred)
2. Incoming traffic to CPE is controlled using AS Path Prepend attribute of BGP at secondary( lower as path count , better path)
Normal Scenario
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Primary WAN link is up .HSRP running on CPE-1 towards LAN is active state. CPE-1 has routes to other location from both EBGP and IBGP but will be preferred via PE1 (High Local Preference configured ).Whereas AS prepend is configured on CPE-2 Continue reading


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This post is going to be a little off the beaten path, but it might yet be useful for folks interested in the process of standardization through the IETF.
Last week, at the IETF in Buenos Aires, a proposal was put forward to move the IPv4 specifications to historic status. Geoff Huston, in his ISP column, points out the problem with this sort of thing—
The idea to push IPv4 to historic is, apparently, an attempt to move the market, in a sense. If it’s historic, then the market won’t use it, or will at least move away from it.
Right.
Another, similar, line of thinking came up at the mic during a discussion around whether Continue reading