RIP version2 with authentication

(supports VLSM, uses Multicast for updates 224.0.0.9)

key chain ripkeys

 key 1

  key-string ccie

!

interface Ethernet0

 ip address 172.16.50.10 255.255.255.0

 ip rip receive version 1

 ip rip authentication key-chain ripkeys

!

router rip

 version 2

 network 172.16.0.0

 timers basic 30 10 10 20

 no auto-summary

!

To disable split horizon

!

interface Ethernet0

 no ip split-horizon

!

RIP updates from broadcast to unicast

!

router rip

 passive-interface Ethernet 0  (passive-interface with RIP will not send but it will accept updates)

 neighbor 192.168.1.2

!

Increase the cost by x, for a specific advertised network

(could be used to break equal cost load balance)

!

Access-list 1 permit 192.168.2.0 0.0.0.255

!

Router rip

  Network 193.1.1.0

  Offset-list 1 out x Ethernet 0

!

Redistribute static routes

Ip route 192.168.5.0  255.255.255.0  172.68.1.1

Ip route 192.168.3.0  255.255.255.0  172.68.1.1

!

router rip

 network 172.68.0.0

 redistribute  static metric 2 route-map N3

!

access-list 3 permit 192.168.3.0 0.0.0.255

!

route-map N3 permit

    match ip address 3

Redistribute routes learned by other routing protocols

!

interface Ethernet0

  ip address 172.68.70.10 255.255.255.0

!

interface Ethernet1

  ip address 172.68.50.11 255.255.255.0

!

router rip

 network 172.68.0.0

 passive-interface Ethernet 1

 redistribute igrp 100

 default-metric 2

!

router igrp 100

 network 172.68.0.0

 passive-interface Ethernet 0

Manual auto-summary:

Router(config-router)# no auto-summary

Router(config-if)# ip summary-address rip 192.168.1.0  255.255.255.192

Filter incoming updates

RIP will only accept routing updates for 192.168.0.0 networks

R1(config)#access-list 1 permit 192.168.0.0

R1(config-router)#distribute-list 1 in fastEthernet 0/0

ipv6 unicast-routing

!

interface FastEthernet0/0

 no ip address

 duplex auto

 speed auto

 ipv6 address 2001:410:1:10::/64 eui-64

 ipv6 rip riptest enable

!

interface FastEthernet0/1

 no ip address

 duplex auto

 speed auto

 ipv6 address 2001:410:1:20::/64 eui-64

 ipv6 rip riptest enable

!

!option. if you need to add any RIPng global commands

ipv6 router rip riptest

  maximum-paths 6

  ……….

Basic config

The metric depends on Bw, delay,…

interface serial0

 ip address 172.16.50.10 255.255.255.0

 bandwidth 64

!

ip route 0.0.0.0   0.0.0.0  192.168.1.1

!

router igrp 100

 network 172.16.0.0

 timers basic 45 135 145 280  (optional)

 redistribute static metric 128 2000 255 1 2500

Unlike (RIP), IGRP will not automatically redistribute a route to the 0.0.0.0 network. So we need to add redistribute command.

Redistributing IGRP

router igrp 100

 network 172.16.0.0

 network 192.168.254.0

 network 172.30.0.0

 Redistribute igrp 200

!

router igrp 200

 network 172.16.0.0

 network 172.30.0.0

 Redistribute igrp 100

Redistributing RIP

router rip

 network 172.16.0.0

 !

router igrp 200

 network 172.16.0.0

 network 172.30.0.0

 Redistribute rip

 Default-metric 1000 100 255 1 1500

Redistributing eigrp

(we don't need to use redistribute command, because they have same AS)

router eigrp 200

 network 172.16.0.0

!

router igrp 200

 network 172.16.0.0

 network 172.30.0.0

!

Load balance over unequal cost paths

(By default IGRP keeps the lowest cost route)

interface serial0

 ip address 172.16.50.5   255.255.255.252

 bandwidth 64

!

interface serial1

 ip address 172.16.50.9   255.255.255.252

 bandwidth 128

!

router igrp 100

 network 172.16.0.0

Variance 3

Basic config

key chain eigrpkeys

 key 1

   key-string ccie

interface ethernet0

 ip address 170.170.50.10 255.255.255.0

!

interface serial0

 ip address 180.180.50.10 255.255.255.0

 ip authentication mode eigrp 10 md5

 ip authentication key-chain eigrp 10 eigrpkeys

!

router eigrp 10

 network 170.170.0.0

 network 180.180.0.0

no auto-summary

!

(by default, it summaries)

(passive-interface with EIGR will not nor receive updates)

Redistribute-list

any inbound EIGRP route is checked against access list 1.

Any match for 140.175.x.x and 140.176.x.x is placed in the routing table.

router eigrp 100

distribute-list 1 in

!

access-list 1 permit 140.175.0.0 0.0.255.255

access-list 1 permit 140.176.0.0 0.0.255.255

To prevent any routing loops, only networks 150.175.1.0 and 150.175.2.0 are redistributed into OSPF from EIGRP.

router eigrp 100

redistribute ospf 200

distribute-list 1 out ospf 200

!

access-list 1 permit 150.175.1.0 0.0.0.255

access-list 1 permit 150.175.2.0 0.0.0.255

!

router ospf 200

redistribute eigrp 100

Manual auto-summary:

Router(config-router)# no auto-summary

Router(config-if)# ip summary-address eigrp 192.168.10.64  255.255.255.224

Basic config

interface ethernet0

 ip address 170.170.50.10 255.255.255.0

!

interface serial0

 ip address 170.170.60.10  255.255.255.0

 ip ospf  authentication-key ospfkey1

 ip ospf  authentication message-digest

!

router ospf 10

 network 170.170.50.10  0.0.0.0 area 0

 network 170.170.60.10  0.0.0.0 area 1

!

Over NBMA

NBMA rtr

Point2point rtr

interface FastEthernet0/0

 ip address 192.168.1.1 255.255.255.0

!

interface Serial2/0

 ip address 172.16.1.1 255.255.255.0

 encapsulation frame-relay

 ip ospf network broadcast

 frame-relay map ip 172.16.1.2 101 broadcast

!

router ospf 7

 log-adjacency-changes

 network 172.16.1.0 0.0.0.255 area 1

 network 192.168.1.0 0.0.0.255 area 0

!

interface FastEthernet0/0

 ip address 192.168.2.1 255.255.255.0

!

interface Serial2/0

 no ip address

 encapsulation frame-relay

!

interface Serial2/0.101 point-to-point

 ip address 172.16.1.2 255.255.255.0

 ip ospf network broadcast

 frame-relay interface-dlci 202

!

router ospf 7

 log-adjacency-changes

 network 172.16.1.0 0.0.0.255 area 1

 network 192.168.2.0 0.0.0.255 area 1

!

Stub area

External routes do not get flooded into stub areas. Routers in a stub area reach networks that are external to the autonomous system via the default route that is generated by ABR.

Suppose area 2 will be a stub area. In ABR and in router in area 2 add:  area 2 stub.

Totally stub area

Not only are the external routes not listed any more, but neither are inter-area routes. Only the connected routes, or intra-area routes, and the default route generated by the ABR are listed in the routing table.

Suppose area 2 will be a not so stubby area. In ABR and in router in area 2 add:  area 2 stub no-summary.

Not so stubby area

Area 2 is a Totally stub area but it may advertise external routes! For example one router in area2 have a link with a RIP domain. This router will advertise these external routes as Type7 LSA and ABR will convert them to Type 5.

Suppose area 2 will be a not so stubby area. In ABR add : area 2 nssa no-summary and in router in area 2 add:  area 2 nssa..

Change OSPF router ID by changing interface priority:

(by default equal 1 and 0 means will not participate)

Router(config-if)# ip ospf priority 2

Change OSPF router ID by explicit definition:

Router(config-router)# router-id 193.2.2.2

Change load balancing:

(equal cost only. By default 4)

Router(config-router)# maximum-path 6

Manual auto-summary:

(done in ABR, will send to area 0 only a summary route)

Router(config-router)# area 1 range 192.168.10.64  255.255.255.224

In ASBR:

Router(config-router)#summary-address 192.168.10.64  255.255.255.224

Change interface type

(by default ospf advertise the exact ip address of loopback interface (/32). To avoid this change the interface type)

Router(config)# interface loopback 1

Router(config-if)#ip ospf network point-to-point

Manually define the cost

(may be used for Stub's advertised external routes)

Router(config-router)# area 11 default-cost 10

Redistribute rip to ospf

(subnets: will not autosummary – metric-type 1 : the cost will increase cross the network. Type2 will not. Tag: optionally used to filter redistributing ospf to rip to avoid loops)

R1(config-router)#redistribute rip subnets metric-type 1 metric 1500 tag 5

Redistribute with filtering using route-map

R1(config)#Access-list 1 permit 192.168.2.0 0.0.0.255

R1(config)#route-map rip-2-ospf

R1(config-route-map)#match ip address 1

R1(config-router)#redistribute rip route-map rip-2-ospf subnets metric-type 1 metric 1500 tag 5

Virtual link

area 0 -- router A -- area 1 -- router B – area 2

eBGP with authentication (needs direct connection)

Private AS: 64512à65635

iBGP

no need for direct connection

Interface serial 0/0

 Bandwidth 128

 ip address 192.168.1.2  255.255.255.252

!

Router bgp 10500

 Neighbor 192.168.1.1 remote-as 21500

 Neighbor 192.168.1.1 password bgpsecret

 Neighbor 192.168.1.1 next-hop-self

 Network 10.50.1.0 mask 255.255.255.0 (to be advertised)

!

R1#

int loopback 1

 ip add 1.1.1.1    255.255.255.255

router bgp 10500

 neighbor 2.2.2.2 remote-as 10500

 neighbor 2.2.2.2 update-source  loopback 1

R2#

int loopback 2

 ip add 2.2.2.2  255.255.255.255

router bgp 10500

 neighbor 1.1.1.1 remote-as 10500

 neighbor 1.1.1.1 update-source  loopback 2

Router# show ip bgp (summary)

Show ip bgp neighbor

Clear ip bgp * soft