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Link from 2 different ISPs

alsayed
Level 1
Level 1

Kindly,have a look to the attached diagram!

i have 2 wireless connection from 2 different ISPs(ISPA;ISPB)ISP A Terminate link at R1;ISPB Treminate link at R2;i want to achieve the following setup:if the first Link(ISPA)fail the second link (ISPB) TAKE OVER.R1 ITS PRIMARY;R2 ITS SECONDERY;also i want to take into my consideration the LOAD Balence and the redandancy.

How can i achieve like this setup?

10xs for ur reply

27 Replies 27

spremkumar
Level 9
Level 9

Hi Sayed

With the kinda topology you have in placei would suggest to lookout for redundancy in place instead of load balancing.

If you are not having a pool of ips on your own you can have HSRP in combination with NAT which can serve the purpose of both redundancy and access to internet.

Do refer the below link for configuring up the same..

http://www.cisco.com/en/US/partner/products/ps6350/products_configuration_guide_chapter09186a008044edaa.html

regds

Hi regds !

10xs for ur reply;

1)the above link DIDN't open need a CCO account;polz provuide another?

2)plz provise a simple config for this Situation

10xs

HI!

with nat configuration we can achieve my goal:

if the primary Link(ISPA)Goes down the 2nd Link(ISPB) WILL Take over?shoul this work?

10xs

Ali,

you will get all most all the answers from this link:

http://www.cisco.com/warp/public/619/3.html

take a look at this link for configuration:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t4/ftnthsrp.htm

regards

Devang

HI Devang,long Time!!!

10xs for ur reply;i will try this...

ALI

HI EXPERT's!

am confused here about which solution do i use

1)Statful NAT

OR

2)Static NAT in an HSRP Envirment.

Plz Help

10xs

ali,

you have two things in redundancy... one is statful and other is statless...

stateful failover is to continue active flows without interruption if the master fails over to the backup.

it means here you can have your session flow is continue even though your active will goes down...

that will be more clear by the following links:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hiap_c/ch20/haiphsrp.htm

http://www.cisco.com/univercd/cc/td/doc/product/webscale/css/css_750/redundgd/redndncy.htm

so its all depend your need...

regards

Devang

HI Devang!

did u check my Diagram?i want to achieve if the 1 Link from ISPA Goes Down;the 2nd link from ISPB SOULD Take care

10xs

then you can go for normal HSRP with the NAT so it will reduce the complexity with your configuration...

static nat with HSRP

HI!

R1:F0/0:10.10.100.2/24

F0/1:202.10.10.1/30(ISPA Real ip address)

********************************************

R2:F0/0:10.10.100.3/24

F0/1:194.126.10.1/30(ISPB Real ip address)

How could i Config my 2 routers using SNAT With HSRP?

10XS FOR UR GREAT HELP

Active Router Configuration

interface fa0/0

ip address 10.10.100.2 255.255.255.255.0

no ip redirects

ip nat inside

standby 10 priority 105 preempt

standby 10 name HSRP1

standby 10 ip 10.10.100.n

standby 10 track Fa 0/1

!

!

ip nat inside source static/pool -----redundancy HSRP1

ip classless

ip route a.b.c.0 255.255.255.0 fa 0/1

Standby Router Configuration

interface fa0/0

ip address 10.10.100.3 255.255.255.255.0

no ip redirects

ip nat inside

standby 10 priority 100 preempt

standby 10 name HSRP1

standby 10 ip 10.10.100.n

standby 10 track fa 0/1

!

ip nat inside source static/pool -----redundancy HSRP1

ip classless

ip route a.b.c.0 255.255.255 fa 0/1

ali here in ip nat command you can use the static map or nat pool whatever you are looking for... for command reference this is the link: http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a0080087c4c.html

regards

Devang

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