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Cisco Dual ISP Failover Configuration ba Network Engineers Sira.

             Konfigurasaun "Cisco Dual ISP Failover" solusaun ida ne'ebé seguru no efisiente hodi mantein koneksaun internet nian no evita interupsaun ruma. Konfigurasaun ida ne’e importante tebes ba empresa sira ne'ebé depende ba koneksaun internet.

Failover Dual ISP husi Cisco :

Konfigurasaun Dual ISP (Internet Service Provider) Failover husi Cisco ho objetivu atu garante koneksaun internet kontinua lao no la problema wainhira ISP ida falha no hanesan plano reserva ida ne'ebé suporta operasaun rede nian wainhira hetan problema ho koneksaun husi internet principal.

Equimapamento ne'ebe Supporta:

Tenke Utiliza Router Cisco ho versaun ne'ebe suport ba Multiplu ISP.

  1. Configuração de Interfaces:

  2. Ita presiza konfigura interface rede nian iha router atu konekta ho ISP rua. Kada interface konekta ho modem ISP ne'ebé diferente.


  4. Defini IP Routing:

  5. Ita defini caminho routing nian atu trafego internet nian bele muda entre ISP rua depende situasaun nian. Utiliza comando IP routing iha router Cisco atu regula trafego no determina ISP Dual ne'ebé bele utiliza iha momentu ida.


  7. Monitorizasaun e Failover Automático:

  8. Implementa mekanismu monitoring atu verifika kontinuamente estado koneksaun cada ISP. Wainhira deteta falha iha ISP principal, sistema automaticamente muda koneksaun ba ISP alternativu.

Iha sistema monitorizasaun iha rede internet, eziste barak software no ferramenta ne’ebé utiliza ho objetivu monitoriza performansa, seguransa, no estabilidade rede. Sistema sira ne’e bele klasifika ba grupu prinspal sira:

1. Sistema Monitorizasaun Trafiku Rede

  • Wireshark – Captura no analisa paketus iha rede.

  • ntopng – Monitoriza trafiku iha tempo real.

  • MRTG (Multi Router Traffic Grapher) – Gera gráfico ba largura de banda.

2. Sistema Monitorizasaun Estado Rede (Status & Performance Monitoring)

  • Nagios – Monitoriza servisu, rede, no sistema operasaun.

  • Zabbix – Plataforma avancadu atu monitoriza metricas iha rede, servidor, no aplikasaun.

  • PRTG (Paessler Router Traffic Grapher) – Solusaun all-in-one ba monitorizasaun.

  • LibreNMS – Ferramenta open-source atu monitoriza rede ho suporte ba SNMP.

3. Sistema Monitorizasaun Seguransa Rede

  • Suricata – Sistema Intrusion Detection/Prevention (IDS/IPS).

  • Snort – Monitoriza ataque no anomalia iha rede.

  • Security Onion – Plataforma kompletu ba analisa seguransa.

4. Sistema Monitorizasaun Log no Eventu

  • ELK Stack (Elasticsearch, Logstash, Kibana) – Analisa no visualiza logs.

  • Graylog – Sistema centralizadu atu monitoriza logs.

  • Splunk – Ferramenta poderosa ba analisa dados log iha rede.


  2. Teste e Manutenção:

  3. husu atu halo teste sistema failover ne’e atu asegura funcionalidade no efikácia nian. Manten no atualiza software no hardware regularmente atu minimiza riscu falha teknikál.

Konfigurasaun Dual ISP Failover ne'e oferece seguransa adisionál ba rede empresa nian, assegurando kontinuidade negócio nian mesmo iha emergência koneksaun.

IP SLA (Service Level Agreement) 1 iha router Cisco ne'ebé nia funsaun prinsipál maka monitoriza no teste koneksaun rede nian qualidade no performance liuhusi tekniklu simulação trafego rede nian. IP SLA bele usa ba varias aplikações, inklui monitoriza koneksaun internet nian, VoIP (Voice over Internet Protocol), no VPN (Virtual Private Network) conexões. Aqui detalha kona-ba funsaun IP SLA 1 no kona-ba oinsá nia opera iha prátika.

Kriação e Configuração IP SLA 1:

  1. Definição de Operação IP SLA: Ita precisa defini primeiro tipo operasaun IP SLA ne'ebé ita boot hakarak realiza. Por exemplo, teste ping regular ba destinu específiku, verifica la'o mosu konneksaun TCP, ka simula trafego VoIP.

    bash
    Router(config)# ip sla 1
Router(config-ip-sla)# icmp-echo 192.168.1.1 source-interface GigabitEthernet0/1
Router(config-ip-sla-echo)# frequency 30

    Iha ne'e, operasaun ID 1 ne'e simula pings ba IP 192.168.1.1 ho intervalu 30 segundos.

  2. Start-Time no Duration: Ita presiza defini kona-ba oinsá no wainhira operasaun IP SLA 1 ne’e atu komete no termina.

    bash
    Router(config-ip-sla-echo)# start-time now
Router(config-ip-sla-echo)# lifetime 3600

    Iha ne'e, operasaun IP SLA komete agora no la'o durante oras ida (3600 segundos).

  3. Configuração de Resposta Automática: Ita bele defini resposta automatika bazeia ba rezultadu teste ne'ebé realisa. Por exemplo, muda rotas ne'ebé baseia ba teste performance, ka ativa notifikaun ka alarme sira.

    bash
    Router(config-ip-sla-echo)# threshold 100
Router(config-ip-sla-echo)# timeout 1000
Router(config-ip-sla-echo)# exit

    Iha ne'e, operasaun estabelese limite tempu resposta (threshold) ho 100 milisegundos no tempo limite máximo (timeout) ho 1000 milisegundos antes de considera falha operasaun.

  4. Ativação de Rastreamento (Tracking): Ita bele konekta IP SLA operasaun ba sistema de rastreamento atu ita boot monitoriza no responde ba mudansas kondisaun rede.

    bash
    Router(config)# track 1 ip sla 1 reachability
Router(config-track)# delay down 15 up 10

    Iha ne'e, ita ativa track ida ba IP SLA 1 operasaun, no defini tempu delay ba status mudansa down ho up.

Utilização IP SLA:

Operasaun IP SLA ne'e normalmente utiliza atu assegura kualidade servisu entre pontos terminais, teste regularmente koneksaun essensiál sira, no proativamente deteta no responde ba problemas rede antes impacto ba usuário sira. Ita bele haree estatísticas IP SLA ba kada operasaun atu analiza detallu sobre kona-ba rede Up Down(Lakon Mosu)

IP SLA fornece ferramenta ida ne'ebé valiozu ida ba administrador rede atu mantem, otimiza, no assegura performance no reliabilidade iha ambiente rede komplexu.

Tuir mai iha Topologia konaba Failover:


Tabela Prefixes



Konfigurasaun Mak hanesan tuir mai ne'e:

1. Configure ISP1
 ISP1(config)#interface gigabitEthernet 1/0
ISP1(config-if)#ip address 15.1.1.2 255.255.255.252
ISP1(config-if)#no shutdown
ISP1(config-if)#exit
ISP1(config)#
!

ISP1(config)#interface lo1
ISP1(config-if)#ip address 8.8.8.8 255.255.255.255
ISP1(config-if)#exit
!
interface Loopback10
 ip address 1.1.1.1 255.255.255.255
!

Konfigurasaun iha ISP2

interface Loopback1
 ip address 8.8.8.8 255.255.255.255
!
!
interface GigabitEthernet1/0
 ip address 16.1.1.2 255.255.255.252
 negotiation auto
!

=========================
Verifika ISP2

ISP2#sh ip interface brief | exclude un
Interface              IP-Address      OK? Method Status                Protocol
GigabitEthernet1/0     16.1.1.2        YES manual up                    up
Loopback1              8.8.8.8         YES manual up                    up
!



Configurasaun iha R1
===========================================================

interface GigabitEthernet1/0
 description Connected_TO_ISP1
 ip address 15.1.1.1 255.255.255.252
 ip nat outside
 negotiation auto
!
interface GigabitEthernet2/0
 description connected_TO_ISP2
 ip address 16.1.1.1 255.255.255.252
 ip nat outside
 negotiation auto
!
interface GigabitEthernet3/0
 description Conneted_TO_LAN
 ip address 10.1.1.100 255.255.255.0
 ip nat inside
 negotiation auto
!

Verifika R1

R1#sh ip int br | exclude un
Interface              IP-Address      OK? Method Status                Protocol
GigabitEthernet1/0     15.1.1.1        YES manual up                    up
GigabitEthernet2/0     16.1.1.1        YES manual up                    up
GigabitEthernet3/0     10.1.1.100      YES manual up                    up
!

2. Kria ACL 

R1(config)#ip access-list standard NAT
R1(config-std-nacl)#permit 10.1.1.0 0.0.0.255
R1(config-std-nacl)#exit
R1(config)#

Verika ACL

Standard IP access list NAT
    10 permit 10.1.1.0, wildcard bits 0.0.0.255

3.Kria ROUTE-MAP ISP1 iha R1

R1(config)#route-map ISP1 permit 10
R1(config-route-map)#match ip address NAT
R1(config-route-map)#match interface gigabitEthernet 1/0
R1(config-route-map)#exit

Kria ROUTE-MAP ISP2 iha R1
===============================

R1(config)#route-map ISP2 permit 10
R1(config-route-map)#match ip address NAT
R1(config-route-map)#match interface gigabitEthernet 2/0
R1(config-route-map)#exit

Verifika Route MAP

R1#sh route-map
route-map ISP2, permit, sequence 10
  Match clauses:
    ip address (access-lists): NAT
    interface GigabitEthernet2/0
  Set clauses:
  Policy routing matches: 0 packets, 0 bytes
route-map ISP1, permit, sequence 10
  Match clauses:
    ip address (access-lists): NAT
    interface GigabitEthernet1/0
  Set clauses:
  Policy routing matches: 0 packets, 0 bytes
R1#

4. Konfigura IP NAT

ip nat inside source route-map ISP1 interface GigabitEthernet1/0 overload
ip nat inside source route-map ISP2 interface GigabitEthernet2/0 overload


5. Koko teste Ping ba 8.8.8.8 Parece seidauk Repply tamba sei dauk configura ip default ROute
  R1#ping 8.8.8.8
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 8.8.8.8, timeout is 2 seconds:
.....
Success rate is 0 percent (0/5)

6. Kria tan int lo10 iha ISP1
  
ISP1(config)#interface lo10
ISP1(config-if)#ip address 1.1.1.1 255.255.255.255
exi

7. Kria IP SLA 1 iha R1
   
R1(config)#ip sla 1
R1(config-ip-sla)#icmp-echo 1.1.1.1 source-interface gigabitEthernet 1/0
R1(config-ip-sla-echo)#timeout 5000
R1(config-ip-sla-echo)#frequency 5
R1(config-ip-sla-echo)#exit
!
R1(config)#ip sla schedule 1 life forever start-time now


8. Kria IP STATIC ROUTE iha R1

  R1(config)#ip route 1.1.1.1 255.255.255.255 gigabitEthernet 1/0 15.1.1.2

koko teste ping ba 1.1.1.1

R1#ping 1.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/24/32 ms

9. Kria IP DEFAULT ROUTE
  R1(config)#ip route 0.0.0.0 0.0.0.0 15.1.1.2 track 1


R1#sh 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
       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
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is not set

      1.0.0.0/32 is subnetted, 1 subnets
S        1.1.1.1 [1/0] via 15.1.1.2, GigabitEthernet1/0
                 is directly connected, GigabitEthernet1/0
      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.1.1.0/24 is directly connected, GigabitEthernet3/0
L        10.1.1.100/32 is directly connected, GigabitEthernet3/0
      15.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        15.1.1.0/30 is directly connected, GigabitEthernet1/0
L        15.1.1.1/32 is directly connected, GigabitEthernet1/0
      16.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        16.1.1.0/30 is directly connected, GigabitEthernet2/0
L        16.1.1.1/32 is directly connected, GigabitEthernet2/0
R1#

Vefika IPS sla

R1#sh ip sla summary
IPSLAs Latest Operation Summary
Codes: * active, ^ inactive, ~ pending

ID           Type        Destination       Stats       Return      Last
                                           (ms)        Code        Run
-----------------------------------------------------------------------
*1           icmp-echo   1.1.1.1           RTT=32      OK          3 seconds ago



10. Kria track 1 ip sla iha R1

   R1(config)#track 1 ip sla 1 reachability
   R1(config-track)#exit

verifica ip track

R1#sh track 1
Track 1
  IP SLA 1 reachability
  Reachability is Up
    1 change, last change 00:01:01
  Latest operation return code: OK
  Latest RTT (millisecs) 44
  Tracked by:
    STATIC-IP-ROUTING 0
R1#


koko verifika fali IP default route iha R1

R1#sh 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
       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
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 15.1.1.2 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 15.1.1.2
      1.0.0.0/32 is subnetted, 1 subnets
S        1.1.1.1 [1/0] via 15.1.1.2, GigabitEthernet1/0
                 is directly connected, GigabitEthernet1/0
      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.1.1.0/24 is directly connected, GigabitEthernet3/0
L        10.1.1.100/32 is directly connected, GigabitEthernet3/0
      15.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        15.1.1.0/30 is directly connected, GigabitEthernet1/0
L        15.1.1.1/32 is directly connected, GigabitEthernet1/0
      16.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        16.1.1.0/30 is directly connected, GigabitEthernet2/0
L        16.1.1.1/32 is directly connected, GigabitEthernet2/0
R1#


koko test ping ba 8.8.8.8

R1#ping 8.8.8.8
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 8.8.8.8, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/28/44 ms

koko test ping husi LAN

R1#ping 8.8.8.8 source gigabitEthernet 3/0
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 8.8.8.8, timeout is 2 seconds:
Packet sent with a source address of 10.1.1.100
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/32/44 ms
R1#


PC1> tracer 8.8.8.8
trace to 8.8.8.8, 8 hops max, press Ctrl+C to stop
 1   10.1.1.100   15.245 ms  15.828 ms  15.050 ms
 2   *15.1.1.2   45.875 ms (ICMP type:3, code:3, Destination port unreachable)

PC1>

11. Konfigura File OVer

  R1(config)#ip route 0.0.0.0 0.0.0.0 16.1.1.2 10

verifica ip route (file over)

R1#sh run | section route
ip nat inside source route-map ISP1 interface GigabitEthernet1/0 overload
ip nat inside source route-map ISP2 interface GigabitEthernet2/0 overload
ip route 0.0.0.0 0.0.0.0 15.1.1.2 track 1
ip route 0.0.0.0 0.0.0.0 16.1.1.2 10
ip route 1.1.1.1 255.255.255.255 GigabitEthernet1/0
ip route 1.1.1.1 255.255.255.255 GigabitEthernet1/0 15.1.1.2
route-map ISP2 permit 10
 match ip address NAT
 match interface GigabitEthernet2/0
route-map ISP1 permit 10
 match ip address NAT
 match interface GigabitEthernet1/0
R1#


Koko teste File over antes Hamate ISP1


PC1> tracer 8.8.8.8
trace to 8.8.8.8, 8 hops max, press Ctrl+C to stop
 1   10.1.1.100   15.234 ms  15.051 ms  15.381 ms
 2   *15.1.1.2   60.387 ms (ICMP type:3, code:3, Destination port unreachable)

PC1>


Depois de Hamate ISP1 traffic liu husi ip 16.1.1.2

PC1> tracer 8.8.8.8
trace to 8.8.8.8, 8 hops max, press Ctrl+C to stop
 1   10.1.1.100   15.502 ms  15.262 ms  15.613 ms
 2   *16.1.1.2   45.520 ms (ICMP type:3, code:3, Destination port unreachable)

PC1>
PC1>


depois de ISP1 DOWN

R1(config-if)#do sh 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
       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
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 16.1.1.2 to network 0.0.0.0

S*    0.0.0.0/0 [10/0] via 16.1.1.2
      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.1.1.0/24 is directly connected, GigabitEthernet3/0
L        10.1.1.100/32 is directly connected, GigabitEthernet3/0
      16.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        16.1.1.0/30 is directly connected, GigabitEthernet2/0
L        16.1.1.1/32 is directly connected, GigabitEthernet2/0
R1(config-if)#


se kuando ISP1 moris fila fali trafic switch Automaticaly ba fali iha ISP1

R1(config-if)#do sh 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
       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
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 15.1.1.2 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 15.1.1.2
      1.0.0.0/32 is subnetted, 1 subnets
S        1.1.1.1 [1/0] via 15.1.1.2, GigabitEthernet1/0
                 is directly connected, GigabitEthernet1/0
      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.1.1.0/24 is directly connected, GigabitEthernet3/0
L        10.1.1.100/32 is directly connected, GigabitEthernet3/0
      15.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        15.1.1.0/30 is directly connected, GigabitEthernet1/0
L        15.1.1.1/32 is directly connected, GigabitEthernet1/0
      16.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        16.1.1.0/30 is directly connected, GigabitEthernet2/0
L        16.1.1.1/32 is directly connected, GigabitEthernet2/0
R1(config-if)#

12.Kria Network Automation iha R1 hodi Delete Automatic ip nat


R1(config)#event manager applet clear_nat
R1(config-applet)#event track 1 state down
R1(config-applet)#action 1.0 cli command enable
R1(config-applet)#action 1.5 cli command "clear ip nat translation *"
R1(config-applet)#exit
!

R1#clear ip nat translation *


13. Koko Hamate fali ISP1 ho ISP2 hodi halo Komparasaun.




Failover TEST

1. Wainhira la iha failha iha Link entre ISP1 ho R1 QUando ita show ip route iha R1 trafiku liu ISP1 (S*    0.0.0.0/0 [1/0] via 15.1.1.2 )


R1#sh 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
       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
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 15.1.1.2 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 15.1.1.2
      1.0.0.0/32 is subnetted, 1 subnets
S        1.1.1.1 [1/0] via 15.1.1.2, GigabitEthernet1/0
                 is directly connected, GigabitEthernet1/0
      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.1.1.0/24 is directly connected, GigabitEthernet3/0
L        10.1.1.100/32 is directly connected, GigabitEthernet3/0
      15.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        15.1.1.0/30 is directly connected, GigabitEthernet1/0
L        15.1.1.1/32 is directly connected, GigabitEthernet1/0
      16.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        16.1.1.0/30 is directly connected, GigabitEthernet2/0
L        16.1.1.1/32 is directly connected, GigabitEthernet2/0
R1#


2. Se wainhira iha Failansu entre Link R1 to ISP1 automatikamente Trafiku sei liu husi ISP2  S*    0.0.0.0/0 [10/0] via 16.1.1.2

R1(config-if)#do sh ip route
R1(config-if)#do sh 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
       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
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 16.1.1.2 to network 0.0.0.0

S*    0.0.0.0/0 [10/0] via 16.1.1.2
      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.1.1.0/24 is directly connected, GigabitEthernet3/0
L        10.1.1.100/32 is directly connected, GigabitEthernet3/0
      16.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        16.1.1.0/30 is directly connected, GigabitEthernet2/0
L        16.1.1.1/32 is directly connected, GigabitEthernet2/0
R1(config-if)#


3. Se Wainhira Link entre R1 to ISP1 moris autmaticamente Trafiku sei liu ba iha ISP1 (*Apr 12 10:31:29.711: %TRACKING-5-STATE: 1 ip sla 1 reachability Down->Up )

R1(config)#do sh 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
       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
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       + - replicated route, % - next hop override

Gateway of last resort is 15.1.1.2 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 15.1.1.2
      1.0.0.0/32 is subnetted, 1 subnets
S        1.1.1.1 [1/0] via 15.1.1.2, GigabitEthernet1/0
                 is directly connected, GigabitEthernet1/0
      10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        10.1.1.0/24 is directly connected, GigabitEthernet3/0
L        10.1.1.100/32 is directly connected, GigabitEthernet3/0
      15.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        15.1.1.0/30 is directly connected, GigabitEthernet1/0
L        15.1.1.1/32 is directly connected, GigabitEthernet1/0
      16.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C        16.1.1.0/30 is directly connected, GigabitEthernet2/0
L        16.1.1.1/32 is directly connected, GigabitEthernet2/0



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