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OPERATIONAL DEFECT DATABASE
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When a BPG L3Out is created in ACI and BGP neighborship is established between two BGP peers (TCP connection over port 179), then the peers (border leaf in ACI and external device) will exchange capabilities by sending OPEN messages to each other. Within the OPEN messages, the optional parameters field contains the capabilities of the device. In this case, the BGP graceful restart helper capability is not sent from the border leaf in ACI to the BGP peer, even though it is enabled by default.
BPG L3Out in ACI. Border leaf is N9K-C93180YC-FX running 4.2(7l) code, however this could be seen on other platforms as well.
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When a BPG L3Out is created in ACI and BGP neighborship is established between two BGP peers (TCP connection over port 179), then the peers (border leaf in ACI and external device) will exchange capabilities by sending OPEN messages to each other. Within the OPEN messages, the optional parameters field contains the capabilities of the device. In this case, the BGP graceful restart helper capability is not sent from the border leaf in ACI to the BGP peer, even though it is enabled by default. Working scenario: From APIC GUI: Tenants -- > Tenant --> Networking --> L3Outs --> L3Out --> Logical Node Profiles --> Logical Node Profile --> Configured Nodes --> Node Association --> BGP --> Neighbors --> BGP Peer Entry Capabilities Advertised: AS4 capable,Dynamic,Dynamic graceful restart,Dynamic multiprotocol,Dynamic old,Dynamic refresh,Graceful restart helper,IPv4 unicast,Refresh,Refresh From border leaf CLI: leaf# show ip bgp neighbors vrf Neighbor capabilities: Dynamic capability:advertised (mp, refresh, gr)received (mp,refresh,gr) Dynamic capability (old): advertised received Route refresh capability (new): advertised received Route refresh capability (old): advertised received 4-Byte AS capability: advertised received Address family IPv4 Unicast: advertised received Graceful Restart capability: advertised (GR helper only) received PCAP: Border Gateway Protocol - OPEN Message Marker: ffffffffffffffffffffffffffffffff Length: 66 Type: OPEN Message (1) Version: 4 My AS: Hold Time: 180 BGP Identifier: Optional Parameters Length: 37 Optional Parameters Capability: Graceful Restart capability Type: Graceful Restart capability (64) Length: 2 [Expert Info (Chat/Request): Graceful Restart Capability supported in Helper mode only] [Graceful Restart Capability supported in Helper mode only] [Severity level: Chat] [Group: Request] Non-working scenario: From APIC GUI: Tenants -- > Tenant --> Networking --> L3Outs --> L3Out --> Logical Node Profiles --> Logical Node Profile --> Configured Nodes --> Node Association --> BGP --> Neighbors --> BGP Peer Entry Capabilities Advertised: AS4 capable,Dynamic,Dynamic graceful restart,Dynamic multiprotocol,Dynamic old,Dynamic refresh,IPv4 unicast,Refresh,Refresh From border leaf CLI: leaf# show ip bgp neighbors vrf Neighbor capabilities: Dynamic capability: advertised (mp, refresh, gr) Dynamic capability (old): advertised Route refresh capability (new): advertised received Route refresh capability (old): advertised received 4-Byte AS capability: advertised received Address family IPv4 Unicast: advertised received Graceful Restart capability: received Extended Next Hop Encoding Capability: advertised PCAP: Border Gateway Protocol - OPEN Message Marker: ffffffffffffffffffffffffffffffff Length: 62 Type: OPEN Message (1) Version: 4 My AS: Hold Time: 180 BGP Identifier: Optional Parameters Length: 33 Optional Parameters Optional Parameter: Capability Parameter Type: Capability (2) Parameter Length: 31 Capability: Deprecated Dynamic Capability (Cisco) Capability: Support for Dynamic capability Capability: Route refresh capability (Cisco) Capability: Route refresh capability Capability: Multiprotocol extensions capability Capability: Support for 4-octet AS number capability Capability: Extended Next Hop Encoding