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5

! Static Route Tracking, IP SLA.

Static Route Tracking

, LAN WAN. WAN WAN, .

WAN Cisco - IP SLA.

IP SLA - , Cisco IOS, IP , QoS , . IP SLA ( ) . Cisco IP SLA Responder', . IP SLA , , , , .

IP SLA . , ICMP ECHO. IP SLA - .


.

Cisco WAN - ISP1 ISP2. , , - Cisco, IP- (next-hop), :

R1(config)# ip route 0.0.0.0 0.0.0.0 2.2.2.2
R1(config)# ip route 0.0.0.0 0.0.0.0 3.3.3.3 10

, ISP2, 10, .

, , , WAN, UP/UP DOWN/DOWN. , , , , , .

IP SLA .

IP SLA, Cisco IOS - ICMP , WAN , , , .

IP SLA , IP- , IP- ISP. .

IP SLA icmp, IP- ISP1:

R1(config)# ip sla 1
R1(config)# icmp-echo 2.2.2.2 source-interface FastEthernet0/0
R1(config)# timeout 1000
R1(config)# threshold 2
R1(config)# frequency 3
R1(config)# ip sla schedule 1 life forever start-time now

, Cisco IP SLA IOS, IOS, Cisco. IOS 12.4(4) T, 15.(0)1M .

IP SLA.

  • ICMP-echo - ICMP IP 2.2.2.2 3 , frequency.
  • Timeout ( ), SLA Cisco IOS IP .
  • Threshold , SLA Cisco IOS IP.

IP SLA - , SLA. IOS Track Object, :

R1(config)# track 1 ip sla 1 reachability

, IP SLA. IP- , , SLA -.

, show track, :

R1# show track

Track 1
IP SLA 1 reachability
Reachability is Down
1 change, last change 00:03:19
Latest operation return code: Unknown

IP SLA , ISP, :

R1(config)# ip route 0.0.0.0 0.0.0.0 2.2.2.2 track 1
R1(config)# ip route 0.0.0.0 0.0.0.0 3.3.3.3 10

track , , Up. , Down, .

! IP SLA icmp-echo


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