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Fix the Loopback0 IPv6 address of LC's in chassis not reachable from (#16026)

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What I did:
Fix the Loopback0 IPv6 address of LC's in chassis not reachable from peer devices.

Why I did:
For Ipv6 Loopback0 address we only advertise /64 subnet to the peer devices. However, in case of chassis each LC will have it own /128 address of that /64 subnet . Since this /128 address does not get advertised peer devices can-not ping/reach the LC's loopback0.

How I fix:
Advertise /128 Loopback0 Ipv6 address only between i-BGP peers. This way even though /64 is advertised to e-BGP peer devices when packet reaches any of LC's it can reach the appropriate LC's.

How I verify:
Manual verification
UT added for same.

Signed-off-by: Abhishek Dosi <abdosi@microsoft.com>
This commit is contained in:
abdosi 2023-08-06 22:36:33 -07:00 committed by mssonicbld
parent 6876f27374
commit 15a39ac806
3 changed files with 5 additions and 0 deletions
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3
dockers/docker-fpm-frr/frr/bgpd/bgpd.main.conf.j2
View File

@ -104,6 +104,9 @@ router bgp {{ DEVICE_METADATA['localhost']['bgp_asn'] }}
network {{ get_ipv6_loopback_address(LOOPBACK_INTERFACE, "Loopback0") | ip }}/128
{% else %}
network {{ get_ipv6_loopback_address(LOOPBACK_INTERFACE, "Loopback0") | ip }}/64
{% if DEVICE_METADATA['localhost']['switch_type'] == 'voq' or DEVICE_METADATA['localhost']['switch_type'] == 'chassis-packet' %}
network {{ get_ipv6_loopback_address(LOOPBACK_INTERFACE, "Loopback0") | ip }}/128 route-map HIDE_INTERNAL
{% endif %}
{% endif %}
exit-address-family
{% endif %}

1
src/sonic-bgpcfgd/tests/data/sonic-cfggen/bgpd.main.conf.j2/packet_chassis.conf
View File

@ -47,6 +47,7 @@ router bgp 55555
!
address-family ipv6
network fc00::1/64
network fc00::1/128 route-map HIDE_INTERNAL
exit-address-family
!
network 10.10.10.1/24

1
src/sonic-bgpcfgd/tests/data/sonic-cfggen/bgpd.main.conf.j2/voq_chassis.conf
View File

@ -48,6 +48,7 @@ router bgp 55555
!
address-family ipv6
network fc00::1/64
network fc00::1/128 route-map HIDE_INTERNAL
exit-address-family
address-family ipv6
network fc00::2/128 route-map HIDE_INTERNAL