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Questo documento descrive e fornisce configurazioni di esempio per i metodi comuni di perdita di route VRF (Virtual Routing and Forwarding).
Cisco raccomanda la conoscenza dei seguenti argomenti:
Per ulteriori informazioni su questi argomenti, vedere:
Ridistribuisci protocolli di routing
Esempio di ridistribuzione reciproca tra EIGRP e BGP
Informazioni sulla ridistribuzione delle route OSPF in BGP
Per questo documento, sono stati usati router con Cisco IOS® XE versioni 16.12.X e 17.X
Le informazioni discusse in questo documento fanno riferimento a dispositivi usati in uno specifico ambiente di emulazione. Su tutti i dispositivi menzionati nel documento la configurazione è stata ripristinata ai valori predefiniti. Se la rete è operativa, valutare attentamente eventuali conseguenze derivanti dall'uso dei comandi.
Il protocollo VRF consente a un router di gestire tabelle di routing separate per reti virtuali diverse. Quando sono necessarie eccezioni, la perdita di route VRF consente di instradare parte del traffico tra i VRF senza utilizzare route statiche.
Nello scenario 1 viene illustrato un esempio di perdita di route VRF tra BGP e EIGRP. Questo metodo può essere utilizzato per altri IGP.
Il diagramma reticolare illustrato nell'immagine 1 mostra la topologia di livello 3 in cui è necessaria una perdita di percorso.
Immagine 1. Topologia route leaking per lo scenario 1
LEAK del router ha un collegamento BGP con un router adiacente nel VRF A e un router adiacente EIGRP nel VRF globale. Il dispositivo 192.168.11.11 deve essere in grado di connettersi al dispositivo 172.16.10.10 attraverso la rete.
La perdita del router non può effettuare il routing tra i due router perché i percorsi si trovano in VRF diversi. Queste tabelle di routing mostrano i percorsi correnti per VRF e indicano i percorsi che devono essere trafugati tra VRF globale e VRF A.
Tabelle di routing delle perdite:
Tabella di routing EIGRP (routing globale) |
LEAK#show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, m - OMP
n - NAT, Ni - NAT inside, No - NAT outside, Nd - NAT DIA
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
H - NHRP, G - NHRP registered, g - NHRP registration summary
o - ODR, P - periodic downloaded static route, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR
Gateway of last resort is not set
192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.1.0/24 is directly connected, GigabitEthernet2
L 192.168.1.1/32 is directly connected, GigabitEthernet2
192.168.11.0/32 is subnetted, 1 subnets
D 192.168.11.11 [90/130816] via 192.168.1.2, 02:30:29, GigabitEthernet2 >> Route to be exchange to the VRF A routing table.
Tabella di routing VRF A |
LEAK#show ip route vrf A
Routing Table: A
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, m - OMP
n - NAT, Ni - NAT inside, No - NAT outside, Nd - NAT DIA
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
H - NHRP, G - NHRP registered, g - NHRP registration summary
o - ODR, P - periodic downloaded static route, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.0.0.0/30 is directly connected, GigabitEthernet1
L 10.0.0.1/32 is directly connected, GigabitEthernet1
172.16.0.0/32 is subnetted, 1 subnets
B 172.16.10.10 [200/0] via 10.0.0.2, 01:47:58 >> Route to be exchange to the global routing table.
Completare le procedure per creare la perdita tra le due tabelle di routing:
Step 1.
Create route-maps to filter the routes to be injected in both routing tables.
LEAK(config)#Route-map VRF_TO_EIGRP
LEAK(config-route-map)#match ip address prefix-list VRF_TO_EIGRP
LEAK(config-route-map)#exit
!
Prefix-list created to match the host that is attached to the previous route-map configured.
!
ip prefix-list VRF_TO_EIGRP permit 172.16.10.10/32
or
LEAK(config)#Route-map VRF_TO_EIGRP
LEAK(config-route-map)# match ip address 10
LEAK(config-route-map)#exit
!
ACL created to match the host that is attached to the previous route-map.
!
LEAK#show ip access-lists 10
10 permit 172.16.10.10
LEAK(config)#Route-map EIGRP_TO_VRF
LEAK(config-route-map)#match ip address prefix-list EIGRP_TO_VRF
LEAK(config-route-map)#exit
LEAK(config)#
!
Prefix-list created to match the host that is attached to the previous route-map configured.
!
ip prefix-list EIGRP_TO_VRF permit 192.168.11.11/32
or
LEAK(config)#Route-map EIGRP_TO_VRF
LEAK(config-route-map)#match ip address 20
LEAK(config-route-map)#exit
LEAK(config)#
!
ACL created to match the host that is attached to the previous route-map.
!
LEAK#show ip access-list 20
10 permit 192.168.11.11
Step 2.
Define the import/export maps and add the route-map names.
LEAK(config)#vrf definition A
LEAK(config-vrf)#address-family ipv4
LEAK(config-vrf-af)#import ipv4 unicast map EIGRP_TO_VRF >> Import the global routing table routes at the VRF routing table.
LEAK(config-vrf-af)#export ipv4 unicast map VRF_TO_EIGRP >> Export the VRF routes to the Global Routing Table.
LEAK(config-vrf-af)#end
Step 3.
Proceed with the dual redistribution.
Redistribute EIGRP
LEAK(config)#router bgp 1
LEAK(config-router)#redistribute eigrp 1
LEAK(config-router)#end
Redistribution BGP
LEAK(config)#router eigrp 1
LEAK(config-router)#redistribute bgp 1 metric 100 1 255 1 1500
LEAK(config-router)#end
Routing table from VRF A
LEAK#show ip route vrf A
Routing Table: A
< Snip for resume >
10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.0.0.0/30 is directly connected, GigabitEthernet1
L 10.0.0.1/32 is directly connected, GigabitEthernet1
172.16.0.0/32 is subnetted, 1 subnets
B 172.16.10.10 [200/0] via 10.0.0.2, 00:58:53
192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
B 192.168.1.0/24 is directly connected, 00:01:00, GigabitEthernet2
L 192.168.1.1/32 is directly connected, GigabitEthernet2
192.168.11.0/32 is subnetted, 1 subnets
B 192.168.11.11 [20/130816] via 192.168.1.2, 00:01:00, GigabitEthernet2 >> Route from global routing table at VRF A routing table.
Global Routing Table (EIGRP)
LEAK#show ip route
< snip for resume >
Gateway of last resort is not set
172.16.0.0/32 is subnetted, 1 subnets
B 172.16.10.10 [200/0] via 10.0.0.2 (A), 00:04:47 >> Route from VRF A at global routing table.
192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.1.0/24 is directly connected, GigabitEthernet2
L 192.168.1.1/32 is directly connected, GigabitEthernet2
192.168.11.0/32 is subnetted, 1 subnets
D 192.168.11.11 [90/130816] via 192.168.1.2, 01:03:35, GigabitEthernet2
LEAK#
Nello scenario 2 viene descritta la perdita tra due VRF diversi.
In questo documento viene utilizzata la seguente configurazione di rete:
Immagine 2. Topologia route leaking per lo scenario 2
LEAK del router ha un collegamento BGP con un router adiacente nel VRF A e un router adiacente OSPF nel VRF B. Il dispositivo 192.168.11.11 deve connettersi al dispositivo 172.16.10.10 attraverso la rete.
La perdita del router non può effettuare il routing tra i due router perché i percorsi si trovano in VRF diversi. Queste tabelle di routing mostrano i percorsi correnti per VRF e indicano i percorsi che devono essere trafugati tra VRF A e VRF B.
Tabella di routing delle perdite:
Tabella di routing VRF A |
LEAK#show ip route vrf A
Routing Table: A
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, m - OMP
n - NAT, Ni - NAT inside, No - NAT outside, Nd - NAT DIA
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
H - NHRP, G - NHRP registered, g - NHRP registration summary
o - ODR, P - periodic downloaded static route, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.0.0.0/30 is directly connected, Ethernet0/0
L 10.0.0.2/32 is directly connected, Ethernet0/0
172.16.0.0/32 is subnetted, 1 subnets
B 172.16.10.10 [200/0] via 10.0.0.1, 00:03:08 >> Route to be exchange to routing table VRF B.
Tabella di routing VRF B |
LEAK#show ip route vrf B
Routing Table: B
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, m - OMP
n - NAT, Ni - NAT inside, No - NAT outside, Nd - NAT DIA
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
H - NHRP, G - NHRP registered, g - NHRP registration summary
o - ODR, P - periodic downloaded static route, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR
Gateway of last resort is not set
192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.1.0/24 is directly connected, Ethernet0/1
L 192.168.1.2/32 is directly connected, Ethernet0/1
192.168.11.0/32 is subnetted, 1 subnets
O 192.168.11.11 [110/11] via 192.168.1.1, 00:58:45, Ethernet0/1 >> Route to be exchange to routing table VRF A.
Completare le seguenti procedure per creare la perdita tra le due tabelle di routing:
Step 1.
Create route-maps to filter the routes to be injected in both routing tables.
LEAK(config)#Route-map VRFA_TO_VRFB
LEAK(config-route-map)#match ip address prefix-list VRFA_TO_VRFB
LEAK(config-route-map)#exit
!
Prefix-list created to match the host and IP segment that is attached to the previous route-map configured.
!
ip prefix-list VRFA_TO_VRFB permit 172.16.10.10/32
ip prefix-list VRFA_TO_VRFB permit 10.0.0.0/30
or
LEAK(config)#Route-map VRFA_TO_VRFB
LEAK(config-route-map)#match ip address 10
LEAK(config-route-map)#exit
!
ACL created to match the host and IP segment that is attached to the previous route-map.
!
LEAK#show ip access-lists 10
10 permit 172.16.10.10
20 permit 10.0.0.0
LEAK(config)#Route-map VRFB_TO_VRFA
LEAK(config-route-map)#match ip address prefix-list VRFB_TO_VRFA
LEAK(config-route-map)#exit
!
Prefix-list created to match the host and IP segment that is attached to the previous route-map configured.
!
ip prefix-list VRFB_TO_VRFA permit 192.168.11.11/32
ip prefix-list VRFB_TO_VRFA permit 192.168.1.0/24
or
LEAK(config)#Route-map VRFB_TO_VRFA
LEAK(config-route-map)#match ip address 20
LEAK(config-route-map)#exit
!
ACL created to match the host and IP segment that is attached to the previous route-map configured.
!
LEAK#show ip access-lists 20
10 permit 192.168.11.11
20 permit 192.168.1.0
Step 2.
At the VRFs configure the import/export map, use the route-map names to leak the routes.
LEAK(config)#vrf definition A
LEAK(config-vrf)#address-family ipv4
LEAK(config-vrf-af)#export map VRFA_TO_VRFB
LEAK(config-vrf-af)#import map VRFB_TO_VRFA
LEAK(config)#vrf definition B
LEAK(config-vrf)#address-family ipv4
LEAK(config-vrf-af)#export map VRFB_TO_VRFA
LEAK(config-vrf-af)#import map VRFA_TO_VRFB
Step 3.
Add the route-target to import and export the route distinguisher from both VRFs.
! --- Current configuration for VRF A
vrf definition A
rd 1:2
!
address-family ipv4
route-target export 1:2
route-target import 1:1
exit-address-family
! --- Current configuration from VRF B
vrf definition B
rd 2:2
!
address-family ipv4
exit-address-family
! --- Import the routes from VRF B into VRF A
LEAK(config)#vrf definition A
LEAK(config-vrf)#address-family ipv4
LEAK(config-vrf-af)#route-target import 2:2
! --- Import routes from VRF A to VRF B and export routes from VRF B
LEAK(config-vrf-af)#vrf definition B
LEAK(config-vrf)#address-family ipv4
LEAK(config-vrf-af)#route-target import 1:2
LEAK(config-vrf-af)#route-target export 2:2
Check the Routing Tables
VRF A Routing Table
LEAK#show ip route vrf A
Routing Table: A
< Snip for resume >
10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.0.0.0/30 is directly connected, Ethernet0/0
L 10.0.0.2/32 is directly connected, Ethernet0/0
172.16.0.0/32 is subnetted, 1 subnets
B 172.16.10.10 [200/0] via 10.0.0.1, 00:07:20
192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
B 192.168.1.0/24 is directly connected, 00:00:10, Ethernet0/1
L 192.168.1.2/32 is directly connected, Ethernet0/1
192.168.11.0/32 is subnetted, 1 subnets
B 192.168.11.11 [20/11] via 192.168.1.1 (B), 00:00:10, Ethernet0/1 >> Route from VRF B routing table at VRF A.
VRF B Routing Table
LEAK#show ip route vrf B
Routing Table: B
< Snip for resume >
10.0.0.0/30 is subnetted, 1 subnets
B 10.0.0.0 [200/0] via 10.0.0.1 (A), 00:00:15
172.16.0.0/32 is subnetted, 1 subnets
B 172.16.10.10 [200/0] via 10.0.0.1 (A), 00:00:15 >> Route from VRF A routing table at VRF B.
192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.1.0/24 is directly connected, Ethernet0/1
L 192.168.1.2/32 is directly connected, Ethernet0/1
192.168.11.0/32 is subnetted, 1 subnets
O 192.168.11.11 [110/11] via 192.168.1.1, 01:05:12, Ethernet0/1
Nello scenario 3 viene descritta la perdita del percorso tra due IGP (VRF B e VRF globale).
Il documento usa la seguente configurazione di rete:
Immagine 3. Topologia di perdita del percorso per lo scenario 3
LEAK del router ha un adiacente OSPF a un adiacente nel VRF B e un adiacente EIGRP nel VRF globale. La periferica 172.16.10.10 deve essere in grado di connettersi alla periferica 192.168.11.11 attraverso la rete.
Il router LEAK non è in grado di connettere questi due host. Queste tabelle di routing mostrano i percorsi correnti per VRF e indicano i percorsi che devono essere trafugati tra VRF B e VRF globale.
Tabella di routing delle perdite:
Tabella di routing EIGRP (EIGRP) |
LEAK#show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, m - OMP
n - NAT, Ni - NAT inside, No - NAT outside, Nd - NAT DIA
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
H - NHRP, G - NHRP registered, g - NHRP registration summary
o - ODR, P - periodic downloaded static route, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR
Gateway of last resort is not set
192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.1.0/24 is directly connected, Ethernet0/1
L 192.168.1.1/32 is directly connected, Ethernet0/1
192.168.11.0/32 is subnetted, 1 subnets
D 192.168.11.11 [90/1024640] via 192.168.1.2, 01:08:38, Ethernet0/1 >> Route to be exchange from global routing table at VRF B routing table.
VRF B Routing Table (OSPF) |
LEAK#show ip route vrf B
Routing Table: B
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, m - OMP
n - NAT, Ni - NAT inside, No - NAT outside, Nd - NAT DIA
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
H - NHRP, G - NHRP registered, g - NHRP registration summary
o - ODR, P - periodic downloaded static route, l - LISP
a - application route
+ - replicated route, % - next hop override, p - overrides from PfR
Gateway of last resort is not set
10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.0.0.0/30 is directly connected, Ethernet0/0
L 10.0.0.2/32 is directly connected, Ethernet0/0
172.16.0.0/32 is subnetted, 1 subnets
O 172.16.10.10 [110/11] via 10.0.0.1, 01:43:45, Ethernet0/0 >> Route to be exchange from routing table VRF B at global routing table.
Completare le seguenti procedure per creare la perdita tra le due tabelle di routing:
Step 1.
Create route-maps for import and export to be injected in both routing tables.
LEAK(config)#Route-map OSPF_TO_EIGRP
LEAK(config-route-map)#match ip address prefix-list OSPF_TO_EIGRP
LEAK(config-route-map)#exit
!
Prefix-list created to match the host that is attached to the previous route-map configured.
!
ip prefix-list OSPF_TO_EIGRP permit 172.16.10.10/32
ip prefix-list OSPF_TO_EIGRP permit 10.0.0.0/30
or
LEAK(config)#Route-map OSPF_TO_EIGRP
LEAK(config-route-map)#match ip address 10
LEAK(config-route-map)#exit
!
ACL created to match the host that is attached to the previous route-map.
!
LEAK#show ip access-lists 10
10 permit 172.16.10.10
20 permit 10.0.0.0
LEAK(config)#Route-map EIGRP_TO_OSPF
LEAK(config-route-map)#match ip address prefix-list EIGRP_TO_OSPF
LEAK(config-route-map)#exit
!
Prefix-list created to match the host that is attached to the previous route-map configured.
!
ip prefix-list EIGRP_TO_OSPF permit 192.168.11.11/32
ip prefix-list EIGRP_TO_OSPF permit 192.168.1.0/24
or
LEAK(config)#Route-map EIGRP_TO_OSPF
LEAK(config-route-map)#match ip address 20
LEAK(config-route-map)#exit
!
ACL created to match the host that is attached to the previous route-map.
!
LEAK#show ip access-lists 20
10 permit 192.168.11.11
20 permit 192.168.1.0/24
Step 2.
Add the import/export maps in order to match the route-map names.
Current configuration
!
vrf definition B
rd 1:2
!
address-family ipv4
exit-address-family
!
!
LEAK(config-vrf)#vrf definition B
LEAK(config-vrf)#address-family ipv4
LEAK(config-vrf-af)#import ipv4 unicast map EIGRP_TO_OSPF
LEAK(config-vrf-af)#export ipv4 unicast map OSPF_TO_EIGRP
Step 3.
To perform the leak is necessary to create a BGP process, in order to redistribute
the IGPs protocols.
router bgp 1
bgp log-neighbor-changes
!
address-family ipv4 vrf B >> Include the address-family to inject VRF B routing table (OSPF)
!
exit-address-family
Nota: per evitare l'errore, verificare che per il VRF sia configurato un identificatore di route:"%vrf B does not have rd configured, configure "rd" before configuring import route-map"
Step 4.
Create a Dual Redistribution.
IGPs redistribution.
LEAK(config-router)#router bgp 1
LEAK(config-router)#redistribute eigrp 1
!
LEAK(config-router)#address-family ipv4 vrf B
LEAK(config-router-af)#redistribute ospf 1 match internal external 1 external 2
LEAK(config-router-af)#end
BGP Redistribution
LEAK(config)#router ospf 1 vrf B
LEAK(config-router)#redistribute bgp 1
!
LEAK(config-router)#router eigrp TAC
LEAK(config-router)#
LEAK(config-router)# address-family ipv4 unicast autonomous-system 1
LEAK(config-router-af)#
LEAK(config-router-af)# topology base
LEAK(config-router-af-topology)#redistribute bgp 1 metric 100 1 255 1 1500
Controllare le tabelle di routing
Tabella di routing globale |
LEAK#show ip route
< Snip for resume >
172.16.0.0/32 is subnetted, 1 subnets
B 172.16.10.10 [20/11] via 10.0.0.1, 00:14:48, Ethernet0/0 >> Route from VRF B routing table at global routing table ( EIGRP ).
192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.1.0/24 is directly connected, Ethernet0/1
L 192.168.1.1/32 is directly connected, Ethernet0/1
192.168.11.0/32 is subnetted, 1 subnets
D 192.168.11.11 [90/1024640] via 192.168.1.2, 02:16:51, Ethernet0/1
Tabella di routing VRF B |
LEAK#show ip route vrf B
Routing Table: B
< Snip for resume >
10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 10.0.0.0/30 is directly connected, Ethernet0/0
L 10.0.0.2/32 is directly connected, Ethernet0/0
172.16.0.0/32 is subnetted, 1 subnets
O 172.16.10.10 [110/11] via 10.0.0.1, 00:34:25, Ethernet0/0
192.168.1.0/24 is variably subnetted, 2 subnets, 2 masks
B 192.168.1.0/24 is directly connected, 00:08:51, Ethernet0/1
L 192.168.1.1/32 is directly connected, Ethernet0/1
192.168.11.0/32 is subnetted, 1 subnets
B 192.168.11.11 [20/1024640] via 192.168.1.2, 00:08:51, Ethernet0/1 >> Route from global routing table ( EIGRP ) at VRF B routing table.
Revisione | Data di pubblicazione | Commenti |
---|---|---|
4.0 |
16-Oct-2024 |
Formattazione aggiornata. |
3.0 |
12-Jan-2023 |
Rettifica del titolo e correzione del nome dell'autore. Certificato. |
2.0 |
26-Oct-2021 |
Regolazione del titolo e correzione del nome dell'autore |
1.0 |
16-Dec-2020 |
Versione iniziale |