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Home Documentation Junos OS Junos CLI Reference CLI Reference T

Junos CLI Reference

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Junos CLI Reference
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{ "lLangCode": "en", "lName": "English", "lCountryCode": "us", "transcode": "en_US" }
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topology (Protocols BGP)

date_range 20-Nov-23
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Syntax

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topology name {
    community {
        target identifier;
    }
}

Hierarchy Level

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[edit logical-systems logical-system-name protocols bgp family (inet | inet6) unicast],
[edit logical-systems logical-system-name protocols bgp group group-name family (inet | inet6) unicast],
[edit logical-systems logical-system-name protocols bgp group group-name neighbor address family (inet | inet6) unicast],
[edit logical-systems logical-system-name routing-instances routing-instance-name protocols bgp family (inet | inet6) unicast],
[edit logical-systems logical-system-name routing-instances routing-instance-name protocols bgp group group-name family (inet | inet6) unicast],
[edit logical-systems logical-system-name routing-instances routing-instance-name protocols bgp group group-name neighbor address family (inet | inet6) unicast],
[edit protocols bgp family (inet | inet6) unicast],
[edit protocols bgp group group-name family (inet | inet6) unicast],
[edit protocols bgp group group-name neighbor address family (inet | inet6) unicast],
[edit routing-instances routing-instance-name protocols bgp family (inet | inet6) unicast],
[edit routing-instances routing-instance-name protocols bgp group group-name family (inet | inet6) unicast],
[edit routing-instances routing-instance-name protocols bgp group group-name neighbor address family (inet | inet6)]

Description

Enable a topology for BGP multitopology routing. You must first configure one or more topologies under the [edit routing-options] hierarchy level.

Apply the community tags to identify the application topologies by configuring a routing topology name and BGP community value.

In Junos OS, multitopology support for BGP is based on the community value in a BGP route. This configuration determines the association between a topology and one or more community values and populates the topology routing tables. Arriving BGP updates that have a matching community value are replicated in the associated topology routing table. You decide which BGP community values are associated with a given topology.

For example, you can create a configuration that causes BGP updates that are received with community value target:40:40 to be added into topology routing table voice.inet.0 (in addition to the default routing table inet.0). Likewise, you configuration can specify that updates that are received with community value target:50:50 are added into topology routing table video.inet.0 (in addition to the default routing table inet.0).

Options

name

Name of a topology you configured at the [edit routing-options] hierarchy level to create a topology for a specific type of traffic, such as voice or video.

community

Configure the community to identify the multitopology routes. BGP uses the target community identifier to install the routes it learns in the appropriate multitopology routing tables.

  • Syntax: target identifier—Configure the destination to which the route is going.

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 9.0.

Related Documentation

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