pimd: eBGP integration for SA loop detection #17699
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Implement a new zebra API to request route lookup results. This is similar to what `ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB` does, but it gets route information and all next hop information (uses dynamically allocated memory instead of expecting static array). Signed-off-by: Rafael Zalamena <[email protected]>
Implement the 'RFC 4611 Section 2.1. Peering between PIM Border Routers' knob to configure the expected eBGP remote AS number for detecting loops. Signed-off-by: Rafael Zalamena <[email protected]>
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Implement the 'RFC 4611 Section 2.1. Peering between PIM Border Routers' recommendation of using the peer AS number to check for loops in the topology when using direct inter-domains connections. Signed-off-by: Rafael Zalamena <[email protected]>
Let users know that they can utilize the BGP AS integration to detect loops in SAs using the network topology. Signed-off-by: Rafael Zalamena <[email protected]>
Allow MSDP peers to hold the following new information: - Amount of RPF look up failures - Amount of incoming SAs filtered - Amount of outgoing SAs filtered Signed-off-by: Rafael Zalamena <[email protected]>
Add new version of `show msdp peer` command with extra details and a new command to clear MSDP peer counters. Signed-off-by: Rafael Zalamena <[email protected]>
Add topology for testing MSDP eBGP integration. Signed-off-by: Rafael Zalamena <[email protected]>
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This PR implements the optional knob to enable eBGP integration to detect loops in SAs. The detection of MSDP SA loops works as follow:
2.a. If the RPF route AS Path number matches the neighbor AS then the SA is accepted
2.b. if the RPF route AS Path number doesn't match the neighbor (or doesn't exist) the SA is rejected (means that the SA is not coming from the shortest path)