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

Tue Nov 23 10:18:08 EST 2004

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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