Medium I have topology with two Arista switches (ceos1, ceos2) and between them is bgpcep as a BGP EVPN RR. When I create VxLAN at ceos1 device, than this information is sent to bgppcep: from Arista:
// Update message sent from ceos1 to bgpcep. Frame 33: 148 bytes on wire (1184 bits), 148 bytes captured (1184 bits) on interface 0 Linux cooked capture Internet Protocol Version 4, Src: 172.30.0.2, Dst: 172.30.0.4 Transmission Control Protocol, Src Port: 179, Dst Port: 41880, Seq: 1, Ack: 1, Len: 80 Border Gateway Protocol - UPDATE Message Marker: ffffffffffffffffffffffffffffffff Length: 80 Type: UPDATE Message (2) Withdrawn Routes Length: 0 Total Path Attribute Length: 57 Path attributes Path Attribute - ORIGIN: IGP Flags: 0x40, Transitive, Well-known, Complete Type Code: ORIGIN (1) Length: 1 Origin: IGP (0) Path Attribute - AS_PATH: empty Flags: 0x40, Transitive, Well-known, Complete Type Code: AS_PATH (2) Length: 0 Path Attribute - LOCAL_PREF: 100 Flags: 0x40, Transitive, Well-known, Complete Type Code: LOCAL_PREF (5) Length: 4 Local preference: 100 Path Attribute - MP_REACH_NLRI Flags: 0x80, Optional, Non-transitive, Complete Type Code: MP_REACH_NLRI (14) Length: 28 Address family identifier (AFI): Layer-2 VPN (25) Subsequent address family identifier (SAFI): EVPN (70) Next hop network address (4 bytes) Number of Subnetwork points of attachment (SNPA): 0 Network layer reachability information (19 bytes) Path Attribute - PMSI_TUNNEL_ATTRIBUTE Flags: 0xc0, Optional, Transitive, Complete Type Code: PMSI_TUNNEL_ATTRIBUTE (22) Length: 9 Flags: 0 Tunnel Type: Ingress Replication (6) 0000 0000 0000 1100 1111 .... = MPLS Label: 207 Tunnel ID: tunnel end point -> 10.10.10.1
Problem is when this message is resend from bgpcep to Arista device ceos2. Bgpcep change PMSI_TUNNEL_ATTRIBUTE Flags to "0x80, Optional, Non-transitive, Complete".
// Update message sent from bgpcep to ceos2. Frame 37: 148 bytes on wire (1184 bits), 148 bytes captured (1184 bits) on interface 0 Linux cooked capture Internet Protocol Version 4, Src: 172.30.0.4, Dst: 172.30.0.3 Transmission Control Protocol, Src Port: 46842, Dst Port: 179, Seq: 1, Ack: 1, Len: 80 Border Gateway Protocol - UPDATE Message Marker: ffffffffffffffffffffffffffffffff Length: 80 Type: UPDATE Message (2) Withdrawn Routes Length: 0 Total Path Attribute Length: 57 Path attributes Path Attribute - ORIGIN: IGP Flags: 0x40, Transitive, Well-known, Complete Type Code: ORIGIN (1) Length: 1 Origin: IGP (0) Path Attribute - AS_PATH: empty Flags: 0x40, Transitive, Well-known, Complete Type Code: AS_PATH (2) Length: 0 Path Attribute - LOCAL_PREF: 100 Flags: 0x40, Transitive, Well-known, Complete Type Code: LOCAL_PREF (5) Length: 4 Local preference: 100 Path Attribute - MP_REACH_NLRI Flags: 0x80, Optional, Non-transitive, Complete Type Code: MP_REACH_NLRI (14) Length: 28 Address family identifier (AFI): Layer-2 VPN (25) Subsequent address family identifier (SAFI): EVPN (70) Next hop network address (4 bytes) Number of Subnetwork points of attachment (SNPA): 0 Network layer reachability information (19 bytes) Path Attribute - PMSI_TUNNEL_ATTRIBUTE Flags: 0x80, Optional, Non-transitive, Complete Type Code: PMSI_TUNNEL_ATTRIBUTE (22) Length: 9 Flags: 0 Tunnel Type: Ingress Replication (6) 0000 0000 0000 1100 1111 .... = MPLS Label: 207 Tunnel ID: tunnel end point -> 10.10.10.1
After this update message, Arista send back Notification message and break BGP peering with bgpcep. In notification message is data pointing at the PMSI_TUNNEL_ATTRIBUTE.
// Notification message sent from ceos2 to bgpcep. Frame 42565: 101 bytes on wire (808 bits), 101 bytes captured (808 bits) on interface 0 Linux cooked capture Internet Protocol Version 4, Src: 172.30.0.3, Dst: 172.30.0.4 Transmission Control Protocol, Src Port: 179, Dst Port: 59166, Seq: 155, Ack: 316, Len: 33 Border Gateway Protocol - NOTIFICATION Message Marker: ffffffffffffffffffffffffffffffff Length: 33 Type: NOTIFICATION Message (3) Major error Code: UPDATE Message Error (3) Minor error Code (Update Message): Attribute Flags Error (4) Data: 8016090006000cf00a0a0a01
