Friday, August 8, 2014

EIGRP auto-summary, ip default-network, passive-interface, ip summary-address, unequal loadbalancing (variance)




Q1) Use specific wildcard masks on R2 and R3.
: ex)
router eigrp 90
network 172.30.1.0 0.0.0.0

Q2) EIGRP should be configured in such a way that it does not operate like a classful routing protocol.
: router eigrp 90
no auto

Q3) How to advertize default route which is 192.168.1.0/24 in BB? Don't use static and redistribute static.
1. ip route xxxx xxxx xxxx
2. redistribute
3. ip default-network xxxx (IP address must be classful network)
:BB>
conf t
ip defalt-network 192.168.1.0

Q4) EIGRP shold not form neighbor relationships on any interface where other EIGRP routers do not exist.
BB>
conf t
router eigrp 90
passive-interface default (It turns off sending hello packet to every network)
no passive-interface s0/0 (turn on sending hello packet on this interface)
no passive-interface s0/1

R2>
conf t
router eigrp 90
passive-interface f0/0


Q5) Advertize 172.30.0.0 - 172.30.7.255 into a single netowrk in BB
:BB>
int s0/0
ip summary-address eigrp 90 172.30.0.0 255.255.248.0
int s0/1
ip summary-address eigrp 90 172.30.0.0 255.255.248.0

Q6) BB router should perform unequal load balancing to reach the 10.1.2.0/24 network
(By default, EIGRP do the load balancing. However, both load must be exectly same metrics. = variance of one)
 variance of two is  that two times of metric of Feasible distance can be load balanced.
 variance of three is that three times of ''    ''   '')
:BB>
conf t
router eigrp 90
variance 2


----------------------------------------------------------------------------------------------------
Configuration

BB

interface Loopback0
 ip address 172.30.0.1 255.255.255.0
!
interface Loopback1
 ip address 172.30.1.1 255.255.255.0
!
interface Loopback2
 ip address 172.30.2.1 255.255.255.0
!
interface Loopback3
 ip address 172.30.3.1 255.255.255.0
!
interface Loopback4
 ip address 172.30.4.1 255.255.255.0
!
interface Loopback5
 ip address 172.30.5.1 255.255.255.0
!
interface Loopback6
 ip address 172.30.6.1 255.255.255.0
!
interface Loopback7
 ip address 172.30.7.1 255.255.255.0
!
interface Loopback8
 ip address 172.30.8.1 255.255.255.0
!
interface FastEthernet0/0
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface Serial0/0
 bandwidth 128
 ip address 10.1.24.1 255.255.255.252
 ip summary-address eigrp 90 172.30.0.0 255.255.248.0 5
 clock rate 2000000
!
interface FastEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface Serial0/1
 bandwidth 256
 ip address 10.1.34.1 255.255.255.252
 ip summary-address eigrp 90 172.30.0.0 255.255.248.0 5
 clock rate 2000000
!
interface Serial0/2
 no ip address
 shutdown
 clock rate 2000000
!
interface Serial0/3
 no ip address
 shutdown
 clock rate 2000000
!
router eigrp 90
 variance 2
 passive-interface default
 no passive-interface Serial0/0
 no passive-interface Serial0/1
 network 10.1.0.0 0.0.255.255
 network 172.30.0.0
 network 192.168.1.0
 no auto-summary
!
ip default-network 192.168.1.0
ip forward-protocol nd
ip route 192.168.1.0 255.255.255.0 Null0


R2

interface FastEthernet0/0
 ip address 10.1.2.2 255.255.255.0
 speed 100
 full-duplex
!
interface Serial0/0
 bandwidth 128
 ip address 10.1.24.2 255.255.255.252
 clock rate 2000000
!
interface FastEthernet0/1
 ip address 10.1.25.2 255.255.255.0
 duplex auto
 speed auto
!
interface Serial0/1
 no ip address
 shutdown
 clock rate 2000000
!
interface Serial0/2
 no ip address
 shutdown
 clock rate 2000000
!
interface Serial0/3
 no ip address
 shutdown
 clock rate 2000000
!
router eigrp 90
 passive-interface FastEthernet0/1
 network 10.1.2.2 0.0.0.0
 network 10.1.24.2 0.0.0.0
 network 10.1.25.2 0.0.0.0
 no auto-summary


R3

interface FastEthernet0/0
 ip address 10.1.2.3 255.255.255.0
 speed 100
 full-duplex
!
interface Serial0/0
 bandwidth 256
 ip address 10.1.34.2 255.255.255.252
 clock rate 2000000
!
interface FastEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
!
interface Serial0/1
 no ip address
 shutdown
 clock rate 2000000
!
interface Serial0/2
 no ip address
 shutdown
 clock rate 2000000
!
interface Serial0/3
 no ip address
 shutdown
 clock rate 2000000
!
router eigrp 90
 network 10.1.2.3 0.0.0.0
 network 10.1.34.2 0.0.0.0
 no auto-summary

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