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R2 sh ip bgp i Overlay-AS Case 2 propagate-aspath configured under router bgp section for the particular service side VPN address-family ipv4 vrf 1. Route route1 on R2 AS-path: "". Route route1 on R2 AS-path: " " R2 sh ip bgp i Route route1 on R2 AS-path: " ". Route route1 on R2 AS-path: Route route1 on R2 AS-path: , Solution 2 Configure the same site-id on routers cE1 and cE2. You can check this command on vSmart controller in order to understand which routes will receive particular prefix see advertised to : vsmart1 show omp routes Configure ce1 to send extended communities to router ce2: router bgp address-family ipv4 vrf 1 neighbor Contributed by Cisco Engineers Eugene Khabarov.
In IGP protocols, all routers use a common logic within the routing domain to find the shortest path to reach a destination. EGP protocols may require a unique routing policy for every external organization that it exchanges routes.
When BGP was created, the primary design consideration was for IPv4 inter-organization connectivity on public networks, such as the Internet, or private dedicated networks. BGP is the only protocol used to exchange networks on the Internet, which has more than , IPv4 routes and continues to grow. BGP prefers stability within the network, because a link flap could result in route computation for thousands of routes.
Two blocks of private ASNs are available for any organization to use as long as they are never exchanged publicly on the Internet. In the event that an organization does not meet those guidelines, it should use the ASN provided by its service provider.
BGP attaches path attributes PA associated with each network path. Well-known mandatory attributes must be included with every prefix advertisement, whereas well-known discretionary attributes may or may not be included with the prefix advertisement. Optional attributes do not have to be recognized by all BGP implementations. Optional attributes can be set so that they are transitive and stay with the route advertisement from AS to AS.
BGP is a path vector routing protocol and does not contain a complete topology of the network-like link state routing protocols. BGP behaves similar to distance vector protocols to ensure a path is loop free. An address-family correlates to a specific network protocol, such as IPv4, IPv6, and the like, and additional granularity through a subsequent address-family identifier SAFI , such as unicast and multicast.
These attributes are carried inside BGP update messages and are used to carry network reachability information for different address families.
Both terms are the same thing. Network engineers and vendors continue to add functionality and feature enhancements to BGP. This allows for a routing policy in one address-family to be different from a routing policy in a different address family even though the router uses the same BGP session to the other router.
BGP sessions are always point-to-point and are categorized into two types:. Administrative distance AD is a rating of the trustworthiness of a routing information source. If a router learns about a route to a destination from more than one routing protocol, and they all have the same prefix length, AD is compared.
The preference is given to the route with the lower AD. I would like to receive exclusive offers and hear about products from Cisco Press and its family of brands. I can unsubscribe at any time. Pearson Education, Inc. This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site.
Please note that other Pearson websites and online products and services have their own separate privacy policies. Leave a Reply Cancel reply Enter your comment here Fill in your details below or click an icon to log in:. Email required Address never made public. Name required. Loading Comments Now, suppose instead you assign a unique site of origin to each CE router in the network and configure the BGP session on each PE router with the site of origin. The result of the following partial configuration is shown in Figure 2.
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