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Granular BGP advertise-external for MPLS L3VPNs

Granular BGP advertise-external for MPLS L3VPNs

In some BGP multi-homed environments between networks, it is possible to achieve shorter convergence times by using certain features beyond traditional [RFC4271] BGP rules. One of these features is the so-called BGP advertise-external or best-external, so that Autonomous System Border Routers (ASBRs) also advertise the best externally received path, even though it may not result as the ultimate best path from the selection algorithm.

 

 

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Juniper Employee
Inter-AS Option A+B for IPv4 and IPv6 L3VPNs - Part III (Aggregation and filtering)

Inter-AS Option A+B for IPv4 and IPv6 L3VPNs - Part III (Aggregation and filtering)

This post finishes the Inter-AS Option A+B article series in this blog after Inter-AS Option A+B for IPv4 and IPv6 L3VPNs - Part I and Inter-AS Option A+B for IPv4 and IPv6 L3VPNs - Part II (Label substitution), bringing in a more comprehensive application for this use case: the ability to perform IPv4 and IPv6 route aggregation and filtering at this hybrid interconnect.

 

 

 

 

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Juniper Employee
Inter-AS Option A+B for IPv4 and IPv6 L3VPNs - Part II (Label substitution)

Inter-AS Option A+B for IPv4 and IPv6 L3VPNs - Part II (Label substitution)

 

This article follows up Inter-AS Option A+B for IPv4 and IPv6 L3VPNs - Part I with the intention to illustrate intrincate options that a label substitution policy can offer in the same setup.

 

A label substitution policy in Junos OS provides resources to conserve and control labels in an inter-AS option B Autonomous System Border Router (ASBR) with local VRFs. It provides further instrumentation to be able to discern routes further than by its Route Targets (RTs) and determine a label action for them.

 

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Juniper Employee
Inter-AS Option A+B for IPv4 and IPv6 L3VPNs - Part I

Inter-AS Option A+B for IPv4 and IPv6 L3VPNs - Part I

When extending MPLS L3VPNs across more than a single Autonomous System (ASs), multiple interconnect options may be used, as defined in [RFC4364], Section 10. All these options are well-known in the industry, each one with its pros and cons.

 

 

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Juniper Employee
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Archive | 06-17-2020
Re: Netconf and YANG – explained in a layman’s term
Archive | 04-09-2020
Re: Per-prefix LFA
By  Knox
Archive | 01-08-2019
Re: Netconf and YANG – explained in a layman’s term
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