[Nexthop] [fboss2-dev] Add BGP CLI show commands and tests

[manoharan-nexthop]

Pre-submission checklist

• I've ran the linters locally and fixed lint errors related to the files I modified in this PR. You can install the linters by running pip install -r requirements-dev.txt && pre-commit install
• pre-commit run

Summary

Adds BGP CLI show commands for the fboss2 CLI tool. These commands provide visibility into BGP state, configuration, routes, neighbors, and statistics.

BGP Show Commands Added:

Core Commands:

• show bgp summary - Display BGP session summary
• show bgp summary egress - Display egress BGP summary
• show bgp neighbors - Show BGP neighbor information
• show bgp table - Display BGP routing table
• show bgp table - Show specific prefix details
• show bgp table detail - Show detailed routing table
• show bgp table community - Filter by community
• show bgp table more-specifics - Show more specific routes
• show bgp originated-routes - Display originated routes
• show bgp shadowrib - Show shadow RIB entries
• show bgp changelist - Display BGP changelist
• show version bgp - Show BGP version information

Configuration Commands:

• show config running bgp - Display running BGP configuration

Neighbor Route Commands:

• show bgp neighbors received pre-policy - Routes received before policy
• show bgp neighbors received post-policy - Routes received after policy
• show bgp neighbors received rejected - Rejected received routes
• show bgp neighbors advertised pre-policy - Routes to advertise before policy
• show bgp neighbors advertised post-policy - Routes advertised after policy
• show bgp neighbors advertised rejected - Rejected advertised routes
• show bgp neighbors advertised dry-run - Dry-run advertised routes
• show bgp neighbors session-id - Display session ID

Statistics Commands:

• show bgp stats entries - Display BGP entry statistics
• show bgp stats policy - Show BGP policy statistics
• show bgp stats attrs - Display BGP attribute statistics

Stream Commands:

• show bgp stream summary - Display BGP stream summary
• show bgp stream subscriber - Show stream subscribers
• show bgp stream subscriber pre-policy - Pre-policy stream subscribers
• show bgp stream subscriber post-policy - Post-policy stream subscribers

Implementation Details:

Command Handler:

• CmdHandlerImplBgp.cpp - BGP command handler implementation
• CmdList.cpp - Updated to register BGP commands

Utilities:

• CmdShowUtils.cpp/h - Common utilities for BGP show commands
• CmdClientUtils.cpp/h - Client utilities for BGP service communication
• CmdUtilsCommon.cpp - Common command utilities
• NetTools.h - Network utility functions

Tests (22 test files):

• CmdShowBgpSummaryTest.cpp
• CmdShowBgpSummaryEgressTest.cpp
• CmdShowBgpNeighborsTest.cpp
• CmdShowBgpTableTest.cpp
• CmdShowBgpTablePrefixTest.cpp
• CmdShowBgpTableDetailTest.cpp
• CmdShowBgpTableCommunityTest.cpp
• CmdShowBgpTableMoreSpecificsTest.cpp
• CmdShowBgpOriginatedRoutesTest.cpp
• CmdShowBgpShadowRibTest.cpp
• CmdShowBgpChangelistTest.cpp
• CmdShowBgpNeighborsReceivedPrePolicyTest.cpp
• CmdShowBgpNeighborsReceivedPostPolicyTest.cpp
• CmdShowBgpNeighborsReceivedRejectedTest.cpp
• CmdShowBgpNeighborsAdvertisedPrePolicyTest.cpp
• CmdShowBgpNeighborsAdvertisedPostPolicyTest.cpp
• CmdShowBgpNeighborsAdvertisedRejectedTest.cpp
• CmdShowBgpStatsEntriesTest.cpp
• CmdShowBgpStatsPolicyTest.cpp
• CmdShowBgpStatsAttrsTest.cpp
• CmdShowBgpStreamSummaryTest.cpp
• CmdShowBgpStreamSubscriberTest.cpp

Test Infrastructure:

• CmdBgpTestUtils.cpp/h - BGP test utilities
• MockBgpClient.h - Mock BGP client for testing
• CmdHandlerTestBase.h - Base class for command handler tests
• MockClients.h - Mock client implementations
• CmdShowConfigTestUtils.cpp/h - Configuration test utilities
• BgpConfigSessionTest.cpp - BGP configuration session tests

Build System Updates:

• cmake/CliFboss2.cmake - Added BGP command sources
• cmake/CliFboss2Test.cmake - Added BGP test sources

Test Plan

All the CLI unit tests passes.

[induvsuresh]

bgp_thrift.thrift and policy_thrift.thrift have been published already, could we remove from the current PR?

[manoharan-nexthop]

bgp_thrift.thrift and policy_thrift.thrift have been published already, could we remove from the current PR?

@induvsuresh , This has been updated.. please let me know if anything else to be changed. Thanks!

[induvsuresh]

Thank you for the working on this! the test changes, cmake are going to be super useful and it is very thorough

I've left some comments that are blockers for merge , eg: the buck changes etc, could we address that for merge pls