From 8abf2c0e7692f0d28781f8c27300669ed3b079b5 Mon Sep 17 00:00:00 2001 From: Rafael Zalamena Date: Fri, 20 Dec 2024 15:32:04 -0300 Subject: [PATCH] doc: document MSDP peer eBGP AS integration 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 --- doc/user/pim.rst | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/doc/user/pim.rst b/doc/user/pim.rst index ff45f21b5663..d01fd149d6e8 100644 --- a/doc/user/pim.rst +++ b/doc/user/pim.rst @@ -546,10 +546,25 @@ Commands available for MSDP Create or update a mesh group to set the source address used to connect to peers. -.. clicmd:: msdp peer A.B.C.D source A.B.C.D +.. clicmd:: msdp peer A.B.C.D source A.B.C.D [as AS_NUMBER] Create a regular MSDP session with peer using the specified source address. + Optionally the Autonomous Number (AS) can be provided for eBGP assisted + loop detection (see RFC 4611 Section 2.1. Peering between PIM Border + Routers). + + .. note:: + + The BGP configuration must be enabled in order for this feature to work: + + :: + + bgp send-extra-data zebra + + This knob causes BGP to send the AS Path information to ``zebra`` so + MSDP can use that information. + .. clicmd:: msdp peer A.B.C.D sa-filter ACL_NAME Configure incoming or outgoing SA filtering rule.