[bgp] Add design doc for explicitly configuring BGP router id #1643
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lguohan
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…e device (#18727) HLD: sonic-net/SONiC#1643 Add support to explictly specify bgp router id for single asic device Microsoft ADO (number only): 27674485 How I did it 1. When bgp_router_id configured in DEVICE_METADATA, use it as bgp router-id. 2. Remove the hard dependency on loopback0 ipv4 address when adding bgp peer. 3. Add UTs. Behavior of set bgp router-id To be clarified that when bgp router-id hasn't been explicitly set, bgp actions would totally like previous Loopback0 IPv4 address exists Loopback0 IPv4 address doesn't exist bgp_router_id configured Honor bgp_router_id Honor bgp_router_id bgp_router_id not confgd Honor Loopback0 IPv4 address FRR default router ID value is selected as the largest IP address of the device. When router zebra is not enabled bgpd can’t get interface information, so router-id is set to 0.0.0.0 Behavior of add bgp peer To be clarified that when bgp router-id hasn't been explicitly set, bgp actions would totally like previous Loopback0 IPv4 address exists Loopback0 IPv4 address doesn't exist bgp_router_id configured Add BGP peer Add BGP peer bgp_router_id not configured Add BGP peer Do not add BGP peer
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Why I did it HLD: sonic-net/SONiC#1643 Remove hard coupling between bgp router-id and IPv4 address of Loopback4096 Add support to explictly specify bgp router id for multi asic device Work item tracking Microsoft ADO (number only): 27801007 How I did it When bgp_router_id configured in DEVICE_METADATA, use it as bgp router-id and originator-id. Remove the hard dependency on loopback4096 ipv4 address when adding ibgp peer. Add UTs. Behavior of set bgp router-id To be clarified that when bgp router-id hasn't been explicitly set, bgp actions would totally like previous Loopback4096 IPv4 address exists Loopback4096 IPv4 address doesn't exist bgp_router_id configured Honor bgp_router_id Honor bgp_router_id bgp_router_id doesn't be configured Honor Loopback4096 IPv4 address FRR default router ID value is selected as the largest IP address of the device. When router zebra is not enabled bgpd can’t get interface information, so router-id is set to 0.0.0.0 Behavior of add bgp peer To be clarified that when bgp router-id hasn't been explicitly set, bgp actions would totally like previous Loopback4096 IPv4 address exists Loopback4096 IPv4 address doesn't exist bgp_router_id configured Add BGP peer Add BGP peer bgp_router_id doesn't be configured Add BGP peer Do not add iBGP peer How to verify it UT passed.
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This document describes the design details of explicitly configuring BGP router id in SONiC.