Hi Guys,
Needs some help on getting around the BGP unnumbered issue. I think I have my configuration done right but the BGP peers are not even able to finish the TCP handshake with the link local address. Could any please give me some direction?
Test topology:
SP02 -port 96 ------------------------ RA01 - port 100
Network gear:
SP02, RA01 - Arista switch running Sonic
FRR version - 7.01
Linux - 4.9.0-8-2-amd64 #1 SMP Debian 4.9.110-3+deb9u6 (2015-12-19) x86_64 GNU/Linux
SONiC Software Version: SONiC.201904.0-dirty-20190606.153513
Distribution: Debian 9.9
Kernel: 4.9.0-8-2-amd64
##################
RA01
##################
interface Ethernet100
ipv6 nd ra-interval 5
no ipv6 nd suppress-ra
!
interface lo
ip address 100.127.200.3/32
!
router bgp 65593
bgp router-id 100.127.200.3
neighbor ISL peer-group
neighbor ISL remote-as external
neighbor ISL bfd
neighbor ISL capability extended-nexthop
neighbor Ethernet100 interface peer-group ISL
!
address-family ipv4 unicast
redistribute connected route-map ADV_LO
exit-address-family
!
address-family ipv6 unicast
neighbor ISL activate
exit-address-family
!
route-map ADV_LO permit 10
match interface lo
!
###################
Sp02
###################
!
interface Ethernet96
ipv6 nd ra-interval 5
no ipv6 nd suppress-ra
!
interface lo
ip address 100.127.200.2/32
!
router bgp 65592
bgp router-id 100.127.200.2
neighbor ISL peer-group
neighbor ISL remote-as external
neighbor ISL bfd
neighbor ISL capability extended-nexthop
neighbor Ethernet96 interface peer-group ISL
!
address-family ipv4 unicast
redistribute connected route-map ADV_LO
exit-address-family
!
address-family ipv6 unicast
neighbor ISL activate
exit-address-family
!
route-map ADV_LO permit 10
match interface lo
ISSUE:
Both end could not finish the 3 ways handshake because no ACK is returned from either end.
tcpdump on SP02.99:
18:11:25.097912 IP6 fe80::2a99:3aff:fe43:828.60094 > fe80::2a99:3aff:fea0:f79c.bgp: Flags [S], seq 1916461314, win 27120, options [mss 9040,sackOK,TS val 60494016 ecr 0,nop,wscale 7], length 0
18:11:25.098014 IP6 fe80::2a99:3aff:fea0:f79c.bgp > fe80::2a99:3aff:fe43:828.60094: Flags [S.], seq 3862918119, ack 1916461315, win 27084, options [mss 9040,sackOK,TS val 1187858364 ecr 60486120,nop,wscale 7], length 0
no ACK returned from the remote end
tcpdump On RA01.99:
17:21:17.526446 IP6 fe80::2a99:3aff:fea0:f79c.52486 > fe80::2a99:3aff:fe43:828.bgp: Flags [S], seq 2854675523, win 27120, options [mss 9040,sackOK,TS val 1187864576 ecr 0,nop,wscale 7], length 0
17:21:17.526578 IP6 fe80::2a99:3aff:fe43:828.bgp > fe80::2a99:3aff:fea0:f79c.52486: Flags [S.], seq 239598513, ack 2854675524, win 27084, options [mss 9040,sackOK,TS val 60500224 ecr 1187864576,nop,wscale 7], length 0
no ACK returned from the remote end