Routing Policy Implementation
Question
You have been asked to implement routing policy on the PE devices in your AS and to ensure the correct customer routes are installed in the appropriate VRF tables.
Which component should be used as a match condition within your policy?
Answers
Explanations
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A. B. C. D.A
The answer to this question is A. BGP communities.
When implementing routing policy on the PE devices in an AS, BGP communities can be used as a match condition within the policy. A BGP community is a label that is attached to a BGP route advertisement. BGP communities are used to tag routes with additional information that can be used for various purposes such as traffic engineering, policy enforcement, and route filtering.
In this scenario, the goal is to ensure that the correct customer routes are installed in the appropriate VRF tables. By using BGP communities as a match condition within the policy, you can tag customer routes with specific communities that indicate which VRF table the route should be installed in. For example, you can use a specific BGP community to tag routes that belong to a particular customer, and another community to tag routes that belong to another customer. Then, you can create a routing policy that matches on the BGP community value and installs the route in the appropriate VRF table.
VLAN IDs, route distinguishers, and circuit IDs are not relevant components to use as a match condition within the policy in this scenario. VLAN IDs are used to separate network traffic on layer 2 switches, route distinguishers are used to distinguish between identical IPv4 and IPv6 addresses within a VPN, and circuit IDs are used to identify the physical circuit that a packet is traveling over. However, none of these components are directly related to the goal of ensuring that the correct customer routes are installed in the appropriate VRF tables.
