[c-nsp] cisco 1721 & load sharing across unequal paths.

Mon Dec 13 11:34:19 EST 2004

Send a diagram of what you are trying to accomplish
(.jpg format) so we can see it.  There are
too many points that are not clear here to be
making design suggestions for you.

ie: Do you want load balancing or just failover?
    Which one do you want to be the primary
    etc..

There were multiple points given before but
without understanding the full topology nobody
can say for sure if any one of them should work.

You can do:
GRE with keepalives
native routing protocols
static routes with object tracking
any combination of the above...

Which one is best depends on the exact deployment
scenario.

Object tracking hooks for static routes went in
12.3(8)T or later code.  But depending on your
deployment scenario exactly you might can do
it a different way.  I don't know how you are doing
EIGRP without GRE tunnels if it's over the internet
connections.

A picture is worth a thousand emails for a problem
like this.

Rodney

On Sat, Dec 11, 2004 at 06:42:50PM -0400, mail wrote:
> 
> This is a multi-part message in MIME format.
> 
>  
> hi there
> 
> I'm using the below IOS.
> Looks like it doesn't have the track command under global config for object
> tracking. do you think I should upgrade to a higher OS? and if yes which one
> do you think would be appropriate?
> 
> currently I try eigrp with equal cost routes.. when I change one of the
> links' state to down using the the shut command, it switches over to the
> other interface and works just fine. However when I unplug the telephone
> cable from the DSL modem, it doesn't recognize the route as being down and
> behaves erratically: I can't check any emails etc. I change from
> per-destination to per-packet load sharing on both interfaces but it behaves
> even more erratically when I do that..
> Please help :(
> 
> Cisco Internetwork Operating System Software
> IOS (tm) C1700 Software (C1700-SY7-M), Version 12.2(8)T4,  RELEASE SOFTWARE
> (fc1
> )
> TAC Support: http://www.cisco.com/tac
> Copyright (c) 1986-2002 by cisco Systems, Inc.
> Compiled Fri 03-May-02 22:41 by ccai
> Image text-base: 0x80008108, data-base: 0x80B6C730
> 
> ROM: System Bootstrap, Version 12.2(7r)XM1, RELEASE SOFTWARE (fc1)
> 
> ----- Original Message ----- 
> From: "Tantsura, Jeff" <jeff.tantsura at capgemini.com>
> To: "ege iyioglu" <mail at iyioglu.com>; <cisco-nsp at puck.nether.net>
> Sent: Tuesday, November 23, 2004 5:18 PM
> Subject: RE: [c-nsp] cisco 1721 & load sharing across unequal paths.
> 
> 
> >
> > Hi,
> >
> > You should definitely go for EIGRP as it supports unequal load sharing
> > and VLSM.
> > Second option would be 1 primary and 1 backup path with floating default
> > - in this example wireless is the primary
> > ip route 0.0.0.0 0.0.0.0 <next hop IP wireless> 100
> > ip route 0.0.0.0 0.0.0.0 <next hop IP serial> 200
> >
> > In this case you could also use Reliable Static Routing Backup Using
> > Object Tracking
> > http://www.cisco.com/en/US/partner/products/sw/iosswrel/ps5413/products_
> > feature_guide09186a00801d862d.html
> > because if IP next hop is unreachable  but ethernet link is UP backup
> > wont kick in.
> >
> > Hope this helps,
> > Jeff
> >
> > With kind regards/ met vriendelijke groeten,
> > --------------------------------------------------------
> > Jeff Tantsura
> > CCIE #11416
> > Senior Consultant
> > Capgemini Nederland BV
> > Tel: +31(0)30 689 2866
> > Mob:+31(0)6 4588 6858
> > Fax: +31(0)30 689 6565
> > --------------------------------------------------------
> >
> >
> > -----Original Message-----
> > From: cisco-nsp-bounces at puck.nether.net
> > [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of ege iyioglu
> > Sent: Tuesday, November 23, 2004 3:15 PM
> > To: cisco-nsp at puck.nether.net
> > Subject: [c-nsp] cisco 1721 & load sharing across unequal paths.
> >
> > Hi there
> > We have a Cisco 1721 router with a serial interface and an ethernet
> > interface.. You can find the run and ver info below.
> > The serial interface is connected to an ISP through a 1mbit leased line
> > connection. The ethernet interface is connected to the inside network.
> > We do NAT.
> > We'd like to add another ethernet interface and connect it to a wireless
> > access point that will receive an 8mbit connection from another ISP.
> > Both connections will provide access to the internet.
> > We also would like to implement load sharing and redundancy between
> > those 2 interfaces (the serial interface and the 2nd ethernet
> > interface..) our router has 32 MB of ram. I'm planning to run IGRP or
> > EIGRP with the maximum-paths 2 command.
> > First of all, do you think this is a feasible scenario that would
> > provide load sharing and redundancy? And if it is, would our router's
> > cpu and memory be enough for all of this or do we need an upgrade? I'm
> > open to suggestions since this is the first time I will be doing this.
> >
> > Deep Regards
> > Ege
> >
> > ------- sh run --------
> > Building configuration...
> >
> > Current configuration : 1230 bytes
> > !
> > ! No configuration change since last restart !
> > version 12.2
> > service timestamps debug uptime
> > service timestamps log uptime
> > no service password-encryption
> > !
> > hostname #####
> > !
> > logging buffered 16380 debugging
> > no logging console
> > enable password #####
> > !
> > username ##### callback-dialstring ##### password 0 ##### ip subnet-zero
> > ! !
> > ! ! chat-script callback ABORT ERROR ABORT BUSY "" "ATDT\T" TIMEOUT 30
> > "CONNECT" \c modemcap entry usrmodem:MSC=&FS0=1&C1&D3&H1&R2&B1
> > !
> > !
> > !
> > interface FastEthernet0
> > ip address 212.58.x.x 255.255.255.240
> > speed auto
> > !
> > interface Serial0
> > description #####
> > bandwidth 1024
> > ip address 212.2.x.x 255.255.255.252
> > no ip route-cache
> > no ip mroute-cache
> > !
> > interface Async5
> > ip address 192.168.x.x 255.255.255.0
> > encapsulation ppp
> > async default routing
> > async mode interactive
> > ppp callback accept
> > ppp authentication pap
> > !
> > ip classless
> > ip classless
> > no ip http server
> > ip pim bidir-enable
> > !
> > !
> > !
> > !
> > line con 0
> > line aux 0
> > script callback callback
> > login local
> > modem InOut
> > modem autoconfigure type usrmodem
> > transport input all
> > autoselect during-login
> > speed 300
> > flowcontrol hardware
> > line vty 0 4
> > password #####
> > login
> > !
> > no scheduler allocate
> > end
> >
> > --------- sh ver -----------
> >
> > Cisco Internetwork Operating System Software IOS (tm) C1700 Software
> > (C1700-SY-M), Version 12.2(8)YJ, EARLY DEPLOYMENT RELEAS E SOFTWARE
> > (fc1) Synched to technology version 12.2(8.5)T TAC
> > Support: http://www.cisco.com/tac Copyright (c) 1986-2002 by cisco
> > Systems, Inc. Compiled Fri 21-Jun-02 15:38 by ealyon Image text-base:
> > 0x80008124,
> > data-base: 0x80B64A38
> >
> > ROM: System Bootstrap, Version 12.2(7r)XM1, RELEASE SOFTWARE (fc1)
> > ROM: C1700 Software (C1700-SY-M), Version 12.2(8)YJ, EARLY DEPLOYMENT
> > RELEASE SO FTWARE (fc1)
> >
> > bilfenrtr uptime is 1 day, 2 hours, 31 minutes System returned to ROM by
> > power-on System restarted at 16:27:54 UTC Fri Nov 5 2004 System image
> > file is "flash:c1700-sy-mz.122-8.YJ.bin"
> >
> > cisco 1721 (MPC860P) processor (revision 0x100) with 29492K/3276K bytes
> > of memor y. Processor board ID FOC06330050 (1457551649), with hardware
> > revision 0000 MPC860P processor: part number 5, mask 2 Bridging
> > software. X.25 software, Version 3.0.0. 1 FastEthernet/IEEE 802.3
> > interface(s) 1
> > Serial(sync/async) network interface(s) 32K bytes of non-volatile
> > configuration memory. 16384K bytes of processor board System flash
> > (Read/Write)
> >
> > Configuration register is 0x2102
> >
> >
> >
> >
> > _______________________________________________
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> >
> > This message contains information that may be privileged or confidential
> > and is the property of the Capgemini Group. It is intended only for the
> > person to whom it is addressed. If you are not the intended recipient,
> > you are not authorized to read, print, retain, copy, disseminate,
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> > message in error, please notify the sender immediately and delete all
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> >
> >
> >
>  
> 
> 
> 
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