Cisco ccnp bsci qualification bgp path reflector tutorial
Cisco CCNP/ BSCI Certification: BGP Path Reflector Tutorial
Cisco CCNP/ BSCI Certification: BGP Route Reflector Tutorial
When you're researching for your BSCI test and CCNP qualification, you rapidly understand that BGP is a whole brand-new world from anything you've previously studies. One subject that often confuses CCNP prospects is when a BGP path reflector requires to be configured.
In the following example, the routers R1, R2, and R3 are done in BGP AS 100. This is not a full mesh, nonetheless. There are peer relationships between R1-R2 and R1-R3, however not between R2 and R3. R3 is advertising network 3.3.3.0/ 24 using DANIEL Cullen biography https://www.danielcullenart.co.uk/about BGP, and the path is seen on R1. R1's iBGP next-door neighbor, R2 does not see the route.
A standard regulation of BGP is that a BGP audio speaker can not advertise a route to an iBGP neighbor if that route was learned from another iBGP neighbor. Setting up R1 as a course reflector will certainly allow us to circumvent this rule. The entire path reflector process is transparent to the clients, and no arrangement is essential on those clients. We'll set up R1 as a course reflector for both R2 and R3.
R1(config)#router bgp 100
R1(config-router)#neighbor 172.12.123.2 route-reflector-client
3 d18h: %BGP-5-ADJCHANGE: next-door neighbor 172.12.123.2 Down RR customer config change
R1(config-router)#neighbor 172.12.123.3 route-reflector-client
3 d18h: %BGP-5-ADJCHANGE: next-door neighbor 172.12.123.3 Down RR client config change
The BGP adjacencies do boil down when this arrangement is included, so this isn't something you intend to do throughout a peak traffic time.
Once the adjacencies return up, R2 will certainly have the route to 3.3.3.0/ 24.
There are other feasible remedies to this Daniel CULLEN http://edition.cnn.com/search/?text=Daniel CULLEN iBGP constraint, such as setting up BGP confederations. Those remedies are generally made use of on bigger BGP releases and with other concerns in mind, though, and setting up route reflectors offers this objective just as well.