bgpd: Fix BGP to update correct v6 next-hop globally #15919
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Issue: In a dual-stack IPv4/IPv6 BGP session, after the interface is deactivated (ifdown) and then reloaded (ifreload), the global next-hop within BGP is incorrectly updated. Currently, only unnumbered neighbors are handled. We also need to handle an IPv4 neighbor when IPv6 AFI-SAFI is enabled. Fix: When the primary global v6 unicast address is received from Zebra, BGP updates the peer's global next-hop with the correct address and send update to its negibors. Testing: UT, and TestEbgpMultihop tests UT logs: with fix: root@cumulus:mgmt:/tmp# ifdown swp1s0; ifreload -a root@:mgmt:/tmp# vtysh -c "show ip bgp vrf all neighbors" | grep Nexthop Nexthop: 20.1.2.101 Nexthop global: 2001:10:1:2::101 Nexthop local: fe80::7efe:90ff:fefa:e158 without fix after ifreload: Nexthop: 20.1.2.101 Nexthop global: :: Nexthop local: fe80::7efe:90ff:fefa:e158 Ticket: #3870831 Signed-off-by: Rajesh Varatharaj <[email protected]> and Pooja Doijode [email protected]
ton31337
requested changes
May 4, 2024
| link_if = NULL; | ||
| char ip_buf[ETHER_ADDR_STRLEN]; |
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Please move this above link_if and a newline after variables (same is suggested by frrbot/verify check).
| if (IS_ZEBRA_DEBUG_KERNEL) | ||
| zlog_debug( | ||
| " Neighbor Entry received is not on a VLAN or a BRIDGE, ignoring"); | ||
| " Neighbor Entry IF %s(%u) and IP %s is not on a VLAN or BRIDGE, ignoring", |
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nit: and IP can it be one whitespace?
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@Mergifyio backport stable/10.0 |
🟠 Waiting for conditions to match
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@routingrocks could you rebase? |
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This pull request has conflicts, please resolve those before we can evaluate the pull request. |
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Normally, the issue is fixed by #15614, which is now merged |
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Issue:
In a dual-stack IPv4/IPv6 BGP session, after the interface is deactivated (ifdown) and then reloaded (ifreload), the global next-hop within BGP is incorrectly updated. Currently, only unnumbered neighbors are handled.
We also need to handle an IPv4 neighbor when IPv6 AFI-SAFI is enabled.
Fix:
When the primary global v6 unicast address is received from Zebra, BGP updates the peer's global next-hop with the correct address and send update to its negibors.
Testing: UT, and TestEbgpMultihop tests
UT logs:
with fix:
root@:mgmt:/tmp# ifdown swp1s0; ifreload -a root@:mgmt:/tmp# vtysh -c "show ip bgp vrf all neighbors" | grep Nexthop Nexthop: 20.1.2.101
Nexthop global: 2001:10:1:2::101
Nexthop local: fe80::7efe:90ff:fefa:e158
without fix after ifreload:
Nexthop: 20.1.2.101
Nexthop global: ::
Nexthop local: fe80::7efe:90ff:fefa:e158
Ticket: #
Signed-off-by: Rajesh Varatharaj [email protected] and Pooja Doijode [email protected]