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Wednesday, February 24, 2010

simple HSRP - inter vlan routing with external router (subinterface)


This lab use 2 Cisco 2600 series router and 1 Cisco 3560 switch.
in this lab i just use 1 vlan, it didn't work when i have multiple vlan. will work around to solve this problem.

primary gateway is on R1, everytime R1 fail, R2 will take over the gateway.

configure sub interface for fa 0/1 on R1
 interface FastEthernet0/1
 no ip address
 duplex auto
 speed auto
!
interface FastEthernet0/1.1
 description MG VLAN
 encapsulation dot1Q 1 native //follow the vlan number, in this case HSRP for vlan 1
 ip address 172.16.1.2 255.255.255.0
 standby 1 ip 172.16.1.9 //choose a group number, must be same with the other side
 standby 1 priority 150 //default value is 100, higher number got the priority to be primary

configure sub interface for fa 0/0 on R2
 interface FastEthernet0/0
 no ip address
 duplex auto
 speed auto
!
interface FastEthernet0/0.1
 encapsulation dot1Q 1 native
 ip address 172.16.1.3 255.255.255.0
 standby 1 ip 172.16.1.9

configure the password for telnet (line vty) on all devices to test the telnet connectivity later
line vty 0 4
 password cisco
 login

give an ip address for interface vlan 1 on switch (routed interface for this vlan)
interface Vlan1
 ip address 172.16.1.1 255.255.255.0

set port to be trunked to the router
interface GigabitEthernet0/4
 switchport trunk encapsulation dot1q
 switchport mode trunk
!
interface GigabitEthernet0/5
 switchport trunk encapsulation dot1q
 switchport mode trunk

everything should work fine now, let's try

make sure both physical gateway and the HSRP/logical gateway are pingable from DLS1

previously we configure so R1 will have the higher priority, so it'll always be the primary. to confirm this, telnet to 172.16.1.9 from DLS1




good, now everything work as it should. what happen if the primary fail? and how long does it takes before HSRP notice and reroute the traffic? let's do the continuous ping from DLS1 to 172.16.1.9 and disconnect DLS1->R1 connection to know how many packet will be dropped before they change to secondary


by default HSRP will send hello packet to it's peer every 3 second, if the peer didn't reply within 3 hello packet then it's assumed as death, then secondary gateway will take over.

show standby to see the details for the standby configuration


cheers !

6 comments:

  1. Yap Chin HoongFebruary 25, 2010 at 9:11 AM

    This comment has been removed by the author.

    ReplyDelete
  2. Yap Chin HoongFebruary 25, 2010 at 9:12 AM

    hi there, nice meeting with you another Malaysian and great effort for your works. :) Drop by my site too, hope you find something useful. take care and cya... ^_^

    http://itcertguides.blogspot.com/

    ReplyDelete
  3. kenFebruary 25, 2010 at 5:58 PM

    thanks mate ^_^ nice to meet u

    ReplyDelete
  4. UnknownJune 5, 2010 at 10:03 AM

    Hi,

    Nice work. Do you have a contact email? Would like to ask you something. Thanks

    ReplyDelete
  5. UnknownDecember 2, 2013 at 12:45 AM

    Hi all
    I have subinterface on one router and another router without subinterface .
    Are HSRP work with same the configuration above?

    ReplyDelete
  6. UnknownFebruary 13, 2017 at 10:10 PM

    This comment has been removed by the author.

    ReplyDelete

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