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Configuring a Route Reflector (Optional)

Because of the IBGP full-mesh requirement, most networks use route reflectors to simplify configuration. Using a route reflector, you group routers into clusters, which are identified by numeric identifiers unique to the AS. Within the cluster, you must configure a BGP session from a single router (the route reflector) to each internal peer. With this configuration, the IBGP full-mesh requirement is met.

Note: You must have an Advanced BGP Feature license installed on each device that uses a route reflector. For license details, see the JUNOS Software Administration Guide

Figure 71 shows an IBGP network with a Juniper Networks device at IP address 192.168.40.4 acting as a route reflector. In the sample network, each device in Cluster 2.3.4.5 has an internal client relationship to the route reflector. To configure the cluster:

Figure 71: Typical IBGP Network Using a Route Reflector

Image g015034.gif

To configure IBGP in the network using the Juniper Networks device as a route reflector:

  1. Configure all external peering sessions as described in Configuring Point-to-Point Peering Sessions (Required).
  2. Navigate to the top of the configuration hierarchy in either the J-Web or CLI configuration editor.
  3. Perform the configuration tasks described in Table 123.
  4. If you are finished configuring the router, commit the configuration.
  5. Go on to one of the following procedures:

Table 123: Configuring a Route Reflector

Task

J-Web Configuration Editor

CLI Configuration Editor

On the device that you are using as a route reflector, navigate to the Bgp level in the configuration hierarchy.
  1. In the J-Web interface, select Configuration>View and Edit>Edit Configuration.
  2. Next to Protocols, click Edit.
  3. Next to Bgp, click Edit.

From the [edit] hierarchy level, enter

edit protocols bgp

On the device that you are using as a route reflector, create the BGP group cluster-peers, and add to the group the IP addresses of the internal neighbors that you want in the cluster.

  1. In the Group box, click Add new entry.
  2. In the Group name box, type the name of the group in which the BGP peer is configured—cluster-peers in this case.
  3. In the Neighbor box, click Add new entry.
  4. In the Address box, type the IP address of a BGP peer, in dotted decimal notation.
  5. Click OK.
  6. Repeat Step 3 and Step 4 for each BGP neighbor within the cluster that you are configuring.
  1. Create the group cluster-peers, and add the address of an internal neighbor:

    set group cluster-peers neighbor 192.168.6.4

  2. Repeat Step 1 for each BGP neighbor within the cluster that you are configuring.

On the device that you are using as a route reflector, set the group type to internal.

From the Type list, select internal.

From the [edit protocols bgp group internal-peers] hierarchy level:

set type internal

On the device that you are using as a route reflector, configure the cluster identifier for the route reflector.

  1. In the Cluster box, enter the unique numeric cluster identifier.
  2. Click OK.

Set the cluster identifier:

set cluster 2.3.4.5

On the other routers in the cluster, create the BGP group cluster-peers, and add the internal IP address of the route reflector.

You do not need to include the neighbor addresses of the other internal peers, or configure the cluster identifier on these route reflector clients. They need only be configured as internal neighbors.

Note: If the other routers in the network are Juniper Networks devices, follow the steps in this row. Otherwise, consult the router documentation for instructions.

On a client device in the cluster:

  1. In the J-Web interface, select Configuration>View and Edit>Edit Configuration.
  2. Next to Protocols, click Edit.
  3. Next to Bgp, click Edit.
  4. In the Group box, click Add new entry.
  5. In the Group name box, type the name of the group in which the BGP peer is configured—cluster-peers in this case.
  6. In the Neighbor box, click Add new entry.
  7. In the Address box, type the IP address of the route reflector, in dotted decimal notation—in this case, 192.168.40.4.
  8. Click OK.

On a client device in the cluster:

  1. From the [edit] hierarchy level, enter

    edit protocols bgp

  2. Create the group cluster-peers, and add only the route reflector address to the group:

    set group cluster-peers neighbor 192.168.40.4

Configure a routing policy to advertise BGP routes.

See Injecting OSPF Routes into the BGP Routing Table (Optional).
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