Inleiding
Dit document beschrijft hoe u de fabric-connectiviteit tussen twee Virtual Tunnel End Points (VTEP’s) in Virtual Extensible LAN (VxLAN) kunt testen.
Voorwaarden
Vereisten
Cisco raadt kennis van de volgende onderwerpen aan:
- Nexus NX-OS-software
- BGP-protocol (border gateway protocol)
- VLAN
Gebruikte componenten
De informatie in dit document is gebaseerd op Cisco Nexus N9K-C93180YC-EX met NXOS versie 10.3(3).
De informatie in dit document is gebaseerd op de apparaten in een specifieke laboratoriumomgeving. Alle apparaten die in dit document worden beschreven, hadden een opgeschoonde (standaard)configuratie. Als uw netwerk live is, moet u zorgen dat u de potentiële impact van elke opdracht begrijpt.
Configureren
Wanneer VxLAN is ingesteld, willen gebruikers normaal gesproken testen of het werkt zoals verwacht. Terwijl de geadviseerde manier om dit te doen een ping test tussen twee eindgastheren moet doen, die met verschillende VTEPs worden verbonden, is het ook mogelijk om de stoffenconnectiviteit te testen die loopback interfaces op VTEPs gebruiken.
Opmerking: het gebruik van Switch Virtual Interface (SVI) als bron of bestemming van de ping-test is geen geldige test voor de connectiviteit van de stof. De reden is dat we dezelfde IP op stof SVI's hebben vanwege de functie Anycast Gateway.
Netwerkdiagram
Configuraties
Nexus N9K-2 is geconfigureerd als SPINE, terwijl zowel N9K-1 als N9K-2 zijn geconfigureerd als VTEP's in deze VxLAN-implementatie.
Layer 3 is uitgebreid, zodat we een Layer 3 Virtual Network Interface (VNI) op zowel VPN’s als Virtual Routing and Forwarding (VRF) hebben.
Layer 3 VNI geconfigureerd voor VRF evpn_a is 50100.
N9K-1
Stap 1. We configureren een loopback als onderdeel van de VRF die we willen testen.
N9K-1(config)# interface loopback50
N9K-1(config-if)# vrf member evpn_a
Message reported by command :: vrf member evpn_a
Warning: Deleted all L3 config on interface loopback50
N9K-1(config-if)# ip address 10.255.255.1/32
Stap 2. We maken reclame voor deze loopback in de stof. Anders, zelfs als het ICMP-verzoek de bestemming bereikt, kan de bestemming zelf het ICMP-antwoord niet terugsturen.
N9K-1(config)# router bgp 65522
N9K-1(config-router)# vrf evpn_a
N9K-1(config-router-vrf)# address-family ipv4 unicast
N9K-1(config-router-vrf-af)# network 10.255.255.1/32
N9K-2
Stap 1. We configureren een loopback als onderdeel van de VRF die we willen testen.
N9K-2(config)# interface loopback50
N9K-2(config-if)# vrf member evpn_a
Message reported by command :: vrf member evpn_a
Warning: Deleted all L3 config on interface loopback50
N9K-2(config-if)# ip address 10.255.255.2/32
Stap 2. We maken reclame voor deze loopback in de stof. Anders, zelfs als het ICMP-verzoek de bestemming bereikt, kan de bestemming zelf het ICMP-antwoord niet terugsturen.
N9K-2(config)# router bgp 65522
N9K-2(config-router)# vrf evpn_a
N9K-2(config-router-vrf)# address-family ipv4 unicast
N9K-2(config-router-vrf-af)# network 10.255.255.2/32
Verifiëren
Stap 1. Bevestig loopback aanwezig is in de lokale BGP-tabel voor de adresfamilie IPv4 Unicast.
N9K-1# show ip bgp 10.255.255.1/32 vrf evpn_a
BGP routing table information for VRF evpn_a, address family IPv4 Unicast
BGP routing table entry for 10.255.255.1/32, version 732
Paths: (1 available, best #1)
Flags: (0x80c0002) (high32 0x000020) on xmit-list, is not in urib, exported
vpn: version 1053, (0x00000000100002) on xmit-list
Multipath: eBGP iBGP
Advertised path-id 1, VPN AF advertised path-id 1
Path type: local, path is valid, is best path, no labeled nexthop, is extd
AS-Path: NONE, path locally originated
0.0.0.0 (metric 0) from 0.0.0.0 (10.2.254.100)
Origin IGP, MED not set, localpref 100, weight 32768
Extcommunity: RT:65522:50100
VRF advertise information:
Path-id 1 not advertised to any peer
VPN AF advertise information:
Path-id 1 not advertised to any peer
N9K-2# show ip bgp 10.255.255.2/32 vrf evpn_a
BGP routing table information for VRF evpn_a, address family IPv4 Unicast
BGP routing table entry for 10.255.255.2/32, version 241
Paths: (1 available, best #1)
Flags: (0x80c0002) (high32 0x000020) on xmit-list, is not in urib, exported
vpn: version 417, (0x00000000100002) on xmit-list
Multipath: eBGP iBGP
Advertised path-id 1, VPN AF advertised path-id 1
Path type: local, path is valid, is best path, no labeled nexthop, is extd
AS-Path: NONE, path locally originated
0.0.0.0 (metric 0) from 0.0.0.0 (10.2.254.100)
Origin IGP, MED not set, localpref 100, weight 32768
Extcommunity: RT:65522:50100
VRF advertise information:
Path-id 1 not advertised to any peer
VPN AF advertise information:
Path-id 1 not advertised to any peer
Stap 2. Bevestig loopback aanwezig is in de lokale BGP-tabel voor de adresfamilie L2VPN EVPN en wordt geadverteerd naar de verwachte Network Virtual Interface (NVE) peers.
N9K-1# show bgp l2vpn evpn 10.255.255.1 vrf evpn_a
BGP routing table information for VRF default, address family L2VPN EVPN
Route Distinguisher: 10.2.0.49:4 (L3VNI 50100)
BGP routing table entry for [5]:[0]:[0]:[32]:[10.255.255.1]/224, version 36993
Paths: (1 available, best #1)
Flags: (0x000002) (high32 00000000) on xmit-list, is not in l2rib/evpn
Advertised path-id 1
Path type: local, path is valid, is best path, no labeled nexthop
Gateway IP: 0.0.0.0
AS-Path: NONE, path locally originated
10.2.1.49 (metric 0) from 0.0.0.0 (10.2.0.49)
Origin IGP, MED not set, localpref 100, weight 32768
Received label 50100
Extcommunity: RT:65522:50100 ENCAP:8 Router MAC:a0e0.af67.511d
Path-id 1 advertised to peers:
10.2.0.33 10.2.0.34
N9K-2#
LEAF48# show bgp l2vpn evpn 10.255.255.2 vrf evpn_a
BGP routing table information for VRF default, address family L2VPN EVPN
Route Distinguisher: 10.2.0.48:4 (L3VNI 50100)
BGP routing table entry for [5]:[0]:[0]:[32]:[10.255.255.2]/224, version 13373
Paths: (1 available, best #1)
Flags: (0x000002) (high32 00000000) on xmit-list, is not in l2rib/evpn
Advertised path-id 1
Path type: local, path is valid, is best path, no labeled nexthop
Gateway IP: 0.0.0.0
AS-Path: NONE, path locally originated
10.2.1.48 (metric 0) from 0.0.0.0 (10.2.0.48)
Origin IGP, MED not set, localpref 100, weight 32768
Received label 50100
Extcommunity: RT:65522:50100 ENCAP:8 Router MAC:6cb2.aeee.5a97
Path-id 1 advertised to peers:
10.2.0.33 10.2.0.34
Stap 3. Bevestig dat de update is ontvangen van een externe NVE peer.
N9K-1# show bgp l2vpn evpn 10.255.255.2 vrf evpn_a
BGP routing table information for VRF default, address family L2VPN EVPN
Route Distinguisher: 10.2.0.49:4 (L3VNI 50100)
BGP routing table entry for [5]:[0]:[0]:[32]:[10.255.255.2]/224, version 36995
Paths: (1 available, best #1)
Flags: (0x000002) (high32 00000000) on xmit-list, is not in l2rib/evpn, is not in HW
Advertised path-id 1
Path type: internal, path is valid, is best path, no labeled nexthop
Imported from 10.2.0.48:4:[5]:[0]:[0]:[32]:[10.255.255.2]/224
Gateway IP: 0.0.0.0
AS-Path: NONE, path sourced internal to AS
10.2.1.48 (metric 6) from 10.2.0.33 (10.2.0.33)
Origin IGP, MED not set, localpref 100, weight 0
Received label 50100
Extcommunity: RT:65522:50100 Route-Import:10.2.1.147:3100 Source AS:65522:0
ENCAP:8 Router MAC:6cb2.aeee.5a97
Originator: 10.2.0.48 Cluster list: 0.0.255.242
Path-id 1 not advertised to any peer
N9K-2# show bgp l2vpn evpn 10.255.255.1 vrf evpn_a
BGP routing table information for VRF default, address family L2VPN EVPN
Route Distinguisher: 10.2.0.48:4 (L3VNI 50100)
BGP routing table entry for [5]:[0]:[0]:[32]:[10.255.255.1]/224, version 13372
Paths: (1 available, best #1)
Flags: (0x000002) (high32 00000000) on xmit-list, is not in l2rib/evpn, is not in HW
Advertised path-id 1
Path type: internal, path is valid, is best path, no labeled nexthop
Imported from 10.2.0.49:4:[5]:[0]:[0]:[32]:[10.255.255.1]/224
Gateway IP: 0.0.0.0
AS-Path: NONE, path sourced internal to AS
10.2.1.49 (metric 6) from 10.2.0.33 (10.2.0.33)
Origin IGP, MED not set, localpref 100, weight 0
Received label 50100
Extcommunity: RT:65522:50100 Route-Import:10.2.1.49:3100 Source AS:65522:0
ENCAP:8 Router MAC:a0e0.af67.511d
Originator: 10.2.0.49 Cluster list: 0.0.255.242
Path-id 1 not advertised to any peer
Stap 4. Bevestig dat er een route voor externe loopback in de routeringstabel is en dat de volgende-hop de verwachte NVE peer is.
N9K-1# show ip route 10.255.255.2 vrf evpn_a
IP Route Table for VRF "evpn_a"
'*' denotes best ucast next-hop
'**' denotes best mcast next-hop
'[x/y]' denotes [preference/metric]
'%
' in via output denotes VRF
10.255.255.2/32, ubest/mbest: 1/0 *via 10.2.1.48%default, [200/0], 00:12:39, bgp-65522, internal, tag 65522, segid: 50100 tunnelid: 0xa020130 encap: VXLAN N9K-2# show ip route 10.255.255.1 vrf evpn_a IP Route Table for VRF "evpn_a" '*' denotes best ucast next-hop '**' denotes best mcast next-hop '[x/y]' denotes [preference/metric] '%
' in via output denotes VRF
10.255.255.1/32, ubest/mbest: 1/0 *via 10.2.1.49%default, [200/0], 00:15:36, bgp-65522, internal, tag 65522, segid: 50100 tunnelid: 0xa020131 encap: VXLAN
Stap 5. Verzend ICMP-verzoek naar externe loopback met de lokale loopback als bron.
N9K-1# ping 10.255.255.2 source-interface loopback 50
PING 10.255.255.2 (10.255.255.2): 56 data bytes
64 bytes from 10.255.255.2: icmp_seq=0 ttl=254 time=2.009 ms
64 bytes from 10.255.255.2: icmp_seq=1 ttl=254 time=1.26 ms
64 bytes from 10.255.255.2: icmp_seq=2 ttl=254 time=1.231 ms
64 bytes from 10.255.255.2: icmp_seq=3 ttl=254 time=1.142 ms
64 bytes from 10.255.255.2: icmp_seq=4 ttl=254 time=1.127 ms
--- 10.255.255.2 ping statistics ---
5 packets transmitted, 5 packets received, 0.00% packet loss
round-trip min/avg/max = 1.127/1.353/2.009 ms
N9K-2# ping 10.255.255.1 source-interface loopback 50
PING 10.255.255.1 (10.255.255.1): 56 data bytes
64 bytes from 10.255.255.1: icmp_seq=0 ttl=254 time=1.47 ms
64 bytes from 10.255.255.1: icmp_seq=1 ttl=254 time=1.396 ms
64 bytes from 10.255.255.1: icmp_seq=2 ttl=254 time=1.327 ms
64 bytes from 10.255.255.1: icmp_seq=3 ttl=254 time=1.451 ms
64 bytes from 10.255.255.1: icmp_seq=4 ttl=254 time=1.366 ms
--- 10.255.255.1 ping statistics ---
5 packets transmitted, 5 packets received, 0.00% packet loss
round-trip min/avg/max = 1.327/1.402/1.47 ms
Gerelateerde informatie
VXLAN BGP EVPN configureren