EVPN means next-generation all-in-one VPN technology that provides a wide of range of services such as E-LAN, E-Line, E-TREE, L3VPN, DCI, DC-Overlay, IRB, … The following is the mapping between EVPN and traditional VPN technologies.
This topic will introduce EVPN L3VPN.
Firstly, EVPN will provide below different route types, it use Type 5 to advise VPNv4 prefiex.
Topology
Core IGP
router isis core
is-type level-2-only
net 49.0000.0000.0000.4009.00
segment-routing global-block 100000 165534
address-family ipv4 unicast
metric-style wide
segment-routing mpls
!
interface Loopback0
passive
address-family ipv4 unicast
prefix-sid index 9
!
!
interface HundredGigE0/0/1/0
circuit-type level-2-only
point-to-point
address-family ipv4 unicast
EVPN
*********PE1**********
router bgp 1
address-family vpnv4 unicast
!
address-family l2vpn evpn
!
neighbor-group evpn-peer
remote-as 1
update-source Loopback0
address-family l2vpn evpn
advertise vpnv4 unicast re-originated <<<< Send Type 5
!
!
neighbor 172.16.64.21 <<<< Neighbor with PE
use neighbor-group evpn-peer
!
vrf vpn1
address-family ipv4 unicast
!
neighbor 10.1.1.1 <<< Neighbor with CE
remote-as 65535
address-family ipv4 unicast
route-policy pass-all in
route-policy pass-all out
as-override
soft-reconfiguration inbound always
!
!
!
!
RP/0/RP0/CPU0:R2-5501#show run vrf
Fri Oct 25 02:50:36.685 UTC
vrf vpn1
rd 172.16.64.9:1
address-family ipv4 unicast
import route-target
1:1
!
export route-target
1:1
!
Check prefix from peer PE
RP/0/RP0/CPU0:R2-5501# show bgp l2vpn evpn summary
Fri Oct 25 03:14:10.589 UTC
BGP router identifier 172.16.64.9, local AS number 3462
BGP generic scan interval 60 secs
Non-stop routing is enabled
BGP table state: Active
Table ID: 0x0 RD version: 0
BGP main routing table version 203
BGP NSR Initial initsync version 1 (Reached)
BGP NSR/ISSU Sync-Group versions 0/0
BGP scan interval 60 secs
BGP is operating in STANDALONE mode.
Process RcvTblVer bRIB/RIB LabelVer ImportVer SendTblVer StandbyVer
Speaker 203 203 203 203 203 0
Neighbor Spk AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down St/PfxRcd
172.16.64.21 0 1 922 922 203 0 0 13:02:12 20 <<< Recieve Count.20 prefix
RP/0/RP0/CPU0:R2-5501# show bgp l2vpn evpn
Fri Oct 25 03:15:09.399 UTC
BGP router identifier 172.16.64.9, local AS number 1
BGP generic scan interval 60 secs
Non-stop routing is enabled
BGP table state: Active
Table ID: 0x0 RD version: 0
BGP main routing table version 203
BGP NSR Initial initsync version 1 (Reached)
BGP NSR/ISSU Sync-Group versions 0/0
BGP scan interval 60 secs
Status codes: s suppressed, d damped, h history, * valid, > best
i - internal, r RIB-failure, S stale, N Nexthop-discard
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 172.16.64.21:1
*>i[5][0][32][200.0.0.1]/80
172.16.64.21 100 0 65535 {1} i
*>i[5][0][32][200.0.0.2]/80
172.16.64.21 100 0 65535 {1} i
<snip>
RP/0/RP0/CPU0:R2-5501# show bgp l2vpn evpn rd 172.16.64.21:1 [5][0][32][200.0.0.1]/80 detail
Fri Oct 25 03:17:55.241 UTC
BGP routing table entry for [5][0][32][200.0.0.1]/80, Route Distinguisher: 172.16.64.21:1
Versions:
Process bRIB/RIB SendTblVer
Speaker 197 197
Flags: 0x00040001+0x00000000;
Last Modified: Oct 25 03:11:11.348 for 00:06:44
Paths: (1 available, best #1)
Not advertised to any peer
Path #1: Received by speaker 0
Flags: 0x4000000025060005, import: 0x1f, EVPN: 0x1
Not advertised to any peer
65101 {1}
172.16.64.21 (metric 10) from 172.16.64.21 (172.16.64.21), if-handle 0x00000000
Received Label 24002 <<<< BGP label
Origin IGP, localpref 100, valid, internal, best, group-best, import-candidate, not-in-vrf
Received Path ID 0, Local Path ID 1, version 197
Extended community: Flags 0x6: RT:1:1
EVPN ESI: 0000.0000.0000.0000.0000, Gateway Address : 0.0.0.0
RP/0/RP0/CPU0:R2-5501#show bgp vpnv4 unicast
Fri Oct 25 03:20:52.534 UTC
BGP router identifier 172.16.64.9, local AS number 1
BGP generic scan interval 60 secs
Non-stop routing is enabled
BGP table state: Active
Table ID: 0x0 RD version: 0
BGP main routing table version 284
BGP NSR Initial initsync version 2 (Reached)
BGP NSR/ISSU Sync-Group versions 0/0
BGP scan interval 60 secs
Status codes: s suppressed, d damped, h history, * valid, > best
i - internal, r RIB-failure, S stale, N Nexthop-discard
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
Route Distinguisher: 172.16.64.9:1 (default for vrf vpn1)
*> 100.0.0.1/32 10.1.1.1 0 65535 {1} i
*> 100.0.0.2/32 10.1.1.1 0 65535 {1} i
*> 100.0.0.3/32 10.1.1.1 0 65535 {1} i
*> 100.0.0.4/32 10.1.1.1 0 65535 {1} i
*> 100.0.0.5/32 10.1.1.1 0 65535 {1} i
*> 100.0.0.6/32 10.1.1.1 0 65535 {1} i
*> 100.0.0.7/32 10.1.1.1 0 65535 {1} i
*> 100.0.0.8/32 10.1.1.1 0 65535 {1} i
*> 100.0.0.9/32 10.1.1.1 0 65535 {1} i
*> 100.0.0.10/32 10.1.1.1 0 65535 {1} i
*>i200.0.0.1/32 172.16.64.21 100 0 65535 {1} i
*>i200.0.0.2/32 172.16.64.21 100 0 65535 {1} i
*>i200.0.0.3/32 172.16.64.21 100 0 65535 {1} i
*>i200.0.0.4/32 172.16.64.21 100 0 65535 {1} i
*>i200.0.0.5/32 172.16.64.21 100 0 65535 {1} i
*>i200.0.0.6/32 172.16.64.21 100 0 65535 {1} i
*>i200.0.0.7/32 172.16.64.21 100 0 65535 {1} i
*>i200.0.0.8/32 172.16.64.21 100 0 65535 {1} i
*>i200.0.0.9/32 172.16.64.21 100 0 65535 {1} i
*>i200.0.0.10/32 172.16.64.21 100 0 65535 {1} i
*>i200.0.0.11/32 172.16.64.21 100 0 65535 {1} i
*>i200.0.0.12/32 172.16.64.21 100 0 65535 {1} i
*>i200.0.0.13/32 172.16.64.21 100 0 65535 {1} i
*>i200.0.0.14/32 172.16.64.21 100 0 65535 {1} i
*>i200.0.0.15/32 172.16.64.21 100 0 65535 {1} i
*>i200.0.0.16/32 172.16.64.21 100 0 65535 {1} i
*>i200.0.0.17/32 172.16.64.21 100 0 65535 {1} i
*>i200.0.0.18/32 172.16.64.21 100 0 65535 {1} i
*>i200.0.0.19/32 172.16.64.21 100 0 65535 {1} i
*>i200.0.0.20/32 172.16.64.21 100 0 65535 {1} i
RP/0/RP0/CPU0:R2-5501#show bgp vpnv4 unicast rd 172.16.64.9:1 200.0.0.1/32 detail
Fri Oct 25 03:22:05.318 UTC
BGP routing table entry for 200.0.0.1/32, Route Distinguisher: 172.16.64.9:1
Versions:
Process bRIB/RIB SendTblVer
Speaker 265 265
Flags: 0x00001001+0x00000000;
Last Modified: Oct 25 03:11:11.348 for 00:10:54
Paths: (1 available, best #1)
Not advertised to any peer
Path #1: Received by speaker 0
Flags: 0x4401000005060005, import: 0x80
Not advertised to any peer
65101 {1}
172.16.64.21 (metric 10) from 172.16.64.21 (172.16.64.21), if-handle 0x00000000
Received Label 24002
Origin IGP, localpref 100, valid, internal, best, group-best, import-candidate, imported
Received Path ID 0, Local Path ID 1, version 265
Extended community: RT:1:1
EVPN Gateway Address : 0.0.0.0
Source AFI: L2VPN EVPN, Source VRF: default, Source Route Distinguisher: 172.16.64.21:1 <<<<< source was L2vpn EVPN
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