Hello. I passed an interview here and the idea arose to make the next part of the series of articles devoted to the launch of the course "Network Engineer" from OTUS more theoretical in order to answer some of the questions that I encountered during the interview.
Many things here will be more of a basic level in terms of VxLAN and should not cause difficulties.
I. VxLAN MAC ?
, MAC IP EVPN route-type 2. EVPN ?
VLAN:
- (VTEP)
- , MAC — TCAM
- VTEP, MAC IP EVPN route-type 2 ( . Route-reflector(RR), RR VTEP)
, Destination? Host- MAC ARP .
:
- Suppress-ARP
- Suppress-ARP
, . Broadcast VTEP VNI, . Unicast .
, ARP VTEP ARP reply, ARP REQ .
VTEP Destination MAC. , . Suppress-ARP .
II. UDP?
. VxLAN .
, VTEP, VxLAN VNI. UDP, IP Underlay .
VxLAN IP UDP?
- IP — Protocol, , . (wiki):
ICMP - 1
TCP - 6
UDP - 17
GRE - 47— VxLAN , IP , UDP.
, UDP, :
- protocol
- src_ip
- dest_ip
- src_port
- dest_port
— TCP, ? , TCP — , , .. TCP , , , , VxLAN TCP.
III. ingress-replication Multicast
. Multicast . .
.
ingress-replication — ( ARP ) — VxLAN VTEP VxLAN Unicast ( RR). VTEP 1, :
Multicast, VTEP VNI Multicast . , , VTEP ARP IP . IP multicast VNI, — IP NVE. , VNI 10000 c multicast 225.1.10.10
. , , Multicast . — underlay Multicast .
— EVPN, Multicast, ?
. , Multicast . EVPN route-type . , EVPN BGP, , BGP ( RR, BUM ).
, .