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Configuring BGP Within a Network (Required)

To configure BGP sessions between peering networks, you must configure point-to-point sessions between the external peers of the networks. Additionally, you must configure BGP internally to provide a means by which BGP route advertisements can be forwarded throughout the network. Because of the full mesh requirement of IBGP, you must configure individual peering sessions between all internal nodes of the network—unless you use route reflectors or confederations.

Figure 53 shows a typical network with external and internal peer sessions. In the sample network, the Services Router in AS 17 is fully meshed with its internal peers in the group internal-peers, which have IP addresses starting at 192.168.6.4.

Figure 53: Typical Network with EBGP External Sessions and IBGP Internal Sessions

Image g015033.gif

To configure IBGP in the network shown in Figure 53:

  1. Configure all external peering sessions as described in Configuring a Point-to-Point Peering Session (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 56.
  4. If you are finished configuring the network, commit the configuration.
  5. Go on to one of the following procedures:

Table 56: Configuring IBGP Peering Sessions

Task

J-Web Configuration Editor

CLI Configuration Editor

Navigate to the Bgp level in the configuration hierarchy.

In the configuration editor hierarchy, select Protocols>Bgp.

From the top of the configuration hierarchy, enter

edit protocols bgp

Create the BGP group internal-peers, and add the internal neighbor addresses to the group.

You must configure a full IBGP mesh, which requires that each peer be configured with every other internal peer as a BGP neighbor.

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

    set group internal-peers neighbor 192.168.6.4

  2. Repeat Step 1 for each internal BGP neighbor within the network.

Set the group type to internal.

  1. From the Type drop-down menu, select internal.
  2. Click OK.

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

set type internal

Configure a routing policy to advertise BGP routes.

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