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. WIKIMERIONET
Merion Mertics , ,

CRM

FHRP Cisco

3. First Hop Redundancy Protocols

4

DHCP Cisco .

FHRP, VRRP!


1

     HSRP

HSRP. . ( , GNS3), IP- . R2 R3 HSRP. IP- 4.4.4.4 loopback0. , 4.4.4.4. ?

 4.4.4.4

- IP- 4.4.4.4. U (), , .

show ip route

( ip-), , . , IP-.

,    IP-

, R2 R3.

show standby show standby

show standby, , R3 HSRP. , IP- 4.4.4.4.

,     IP- 4.4.4.4

... .

show ip route

, , , FastEthernet1/0 , , - .

show ip interface brief

... .

R3(config)#interface fastEthernet 1/0
R3(config-if)#no shutdown

!

ping 4.4.4.4

, .

ping 4.4.4.4

... 4.4.4.4! , ... HSRP, , R3 ... R2 ?

show standby | begin Preemption show standby | begin Preemption

interface tracking , , 10, FastEthernet1/0 down. , R2 , preemption is disabled HSRP.

R2(config)#interface fastEthernet 0/0
R2(config-if)#standby 1 preempt

R3(config)#interface fastEthernet 0/0
R3(config-if)#standby 1 preempt

, , . . !

: , preemption HSRP, interface tracking

2

     VRRP  HSRP

, VRRP HSRP. : , IP- 4.4.4.4.

ping 4.4.4.4

IP- 4.4.4.4.

show ip route

IP- : 192.168.123.254.

IP- : 192.168.123.254

.

R2    4.4.4.4 R2    4.4.4.4

R2 4.4.4.4, R3 . , R2 4.4.4.4, VRRP, , .

show vrrp show vrrp

show vrrp . , , , , , . , key-string . , R2, R3. , , . :

R2(config)#interface fa0/0
R2(config-if)#vrrp 1 authentication md5 key-string SECRET

key-string .

 key-string

R2 .

R3      R3

R3 . , R2 4.4.4.4, .

show ip route

, R2 , - FastEthernet 1/0.

show ip interface brief

, - shutdown , - , blocking traffic R2 R4, port-security ( ), err-disabled, IP- . !

R2(config)#interface fastEthernet 1/0
R2(config-if)#no shutdown

!

ping 4.4.4.4

!

: , VRRP .