ccnp route IPv4 redistribution

IPV4 Redistribution
========================

Controlling Routing Updates
=======================
Why do you use Multiple protocols ?
- The policies of networking
- conversion between routing protocols
- vendor selection
- Application/Business requirements

Redistribution Issues
========================
If you do redistribution do it in one way rather than two way otherwise there are chances of loop
To redistribute in other direction use static or default route.

ALL internal EIGRP routes are given AD of 90
All external eigrp routes are given AD of 170

Internal eigrp routes are more believable than external eigrp routes
default cost with ospf is 20

Resolving redistribution issues
=============================
Passive Interfaces
Administrative distance modification
Distributive lists / prefix lists (access-list) this allows to use / notation.
Route Maps / Route tagging (kind of scripting for Cisco routers)

Implementing basic redistribution
================================

R1=================R2================R3
       eigrp           ospf


R1
router eigrp 100
network 10.0.0.0
no auto

R2
router eigrp 100
network 10.1.12.0 0.0.0.255
router ospf 1
network 10.1.23.0. 0.0.0.255 area 0


R3
router ospf 1
network 10.0.0.0 0.255.255.255 area 0
seed metric == what metric it starts with.

R2
router ospf 1
redistribute eigrp 100 subnets metric-type 2

When we do this, there will be TYPE 2 type ie E2

Now we need to redistribute ospf to eigrp

R2
router eigrp 100
redistribute ospf 1 metric 100 100 100 100 100

Distribute list allow you send certain routes only. It is always taken from access-list

R2
acce-list 1 permit 10.1.1.0 0.0.0.255
acess-list 1 permit 10.1.3.0 0.0.0.255

distribute-list 1 out


How prefix list work?
very specific process for route filtering esp in case of BGP

R2
ip prefix-list RAJ permit 10.0.0.0/8 le 24


IPV4 Redistribution
========================

Controlling Routing Updates
=======================
Why do you use Multiple protocols ?
- The policies of networking
- conversion between routing protocols
- vendor selection
- Application/Business requirements

Redistribution Issues
========================
If you do redistribution do it in one way otherwise there are chances of loop
To redistribute other way use static or default route.

ALL internal EIGRP routes are given AD of 90
All external ----------------------------- of 170

Internal eigrp routes are more believable than external eigrp routes
default cost with ospf is 20

Resolving redistribution issues
=============================
Passive Interfaces ==
Administrative distance modification
Distributive lists / prefix lists (access-list) this allows to use / notation.
Route Maps / Route tagging (kind of scripting for Cisco routers)