Cisco CCNP BSCI Certification Route Redistribution And The Seed Metric

In the first component to this totally free CCNP / BSCI tutorial, we looked at precisely how leaving just one straightforward phrase out of your route redistribution configuration - "subnets" - led to an incomplete routing family table when redistributing routes through RIP to OSPF. (If everyone missed of which section of the tutorial, visit my website's "Free Tutorials" section.) Today, we could have a look at redistributing OSPF avenues into RIP along with determine an additional frequent redistribution error.

We are utilising your three-router network. R5 is definitely working RIP, R1 is offering like a centre between R5 plus R3 which is working RIP plus OSPF, along with R3 is usually jogging OSPF.

To begin the following lab, we are going to create some loopbacks that will R3 plus promote these people to R1 by using OSPF.

R3(config)#int loopback33

R3(config-if)#ip address 33.3.3.3 255.255.255.255

R3(config-if)#int loopback34

R3(config-if)#ip correct 34.3.3.3 255.255.255.255

R3(config-if)#int loopback35

R3(config-if)#ip target 35.3.3.3 255.255.255.255

R3(config-if)#router ospf 1

R3(config-router)#network 33.3.3.3 0.0.0.0 area 1

R3(config-router)#network 34.3.3.3 0.0.0.0 region 1

R3(config-router)#network 35.3.3.3 0.0.0.0 area 1

R1 sees most of some these tracks around its routing table.

R1#show ip path ospf

34.0.0.0/32 is actually subnetted, just one subnets

O IA 34.3.3.3 [110/65] via 172.12.123.3, 00:00:55, Serial0

35.0.0.0/32 is definitely subnetted, one particular subnets

O IA 35.3.3.3 [110/65] via 172.12.123.3, 00:00:45, Serial0

33.0.0.0/32 is subnetted, a single subnets

O IA 33.3.3.3 [110/65] via 172.12.123.3, 00:00:55, Serial0

We'll right now redistribute these kind of routes into RIP on R1. Remember the "subnets" choice all of us spoke of within the primary aspect of the tutorial? There can be very little these kinds of option when redistributing OSPF tracks in to RIP, since IOS Help exhibits us.

R1(config)#router rip

R1(config-router)#redistribute ospf 1 ?

go with Redistribution connected with OSPF routes

metric Metric to get redistributed routes

route-map Route chart reference

vrf VPN Routing/Forwarding Instance

R1(config-router)#redistribute ospf 1

The avenues happen to be redistributed towards RIP using your redistribute ospf 1 command. (The "1" could be the OSPF method number.) Let's examine R5 and see that results.

R5#show ip option rip

R5#

The routes aren't there, although many of us couldn't get yourself a word of caution through the router that individuals were required to do nearly anything else. What is the problem?

The challenge is the fact RIP requires your seed metric that they are chosen any time redistributing paths towards that protocol. A seedling metric is really a "starter metric" that gives that RIP procedure a metric it could possibly perform with. The OSPF metric involving expense is incomprehensible to RIP, seeing that RIP's exclusive metric can be hop count. We've got to supply RIP a metric them comprehends when redistributing avenues in to that will protocol, so let me return to R1 as well as accomplish so.

R1(config)#router rip

R1(config-router)#no redistribute ospf 1

R1(config-router)#redistribute ospf 1 metric 2

R5 right now sees the particular routes. Note which the metric from your mounting brackets will be seed metric.

R5#show ip route rip

34.0.0.0/32 can be subnetted, 1 subnets

R 34.3.3.3 [120/2] by means of 100.1.1.1, 00:00:24, Ethernet0

35.0.0.0/32 is usually subnetted, 1 subnets

R 35.3.3.3 [120/2] via 100.1.1.1, 00:00:24, Ethernet0

33.0.0.0/32 is usually subnetted, 1 subnets

R 33.3.3.3 [120/2] via 100.1.1.1, 00:00:24, Ethernet0

If a person read the previous tutorial, maybe you have noticed that individuals would not stipulate your seed starting metric for OSPF. OSPF doesn't necessitate your seed metric to be fixed in the course of redistribution. You additionally noticed that this router did reveal that now there could possibly always be problems once we remaining your "subnets" selection out of RIP>OSPF redistribution, but the router don't say to us all nearly anything concerning a new seed metric when most of us carried out OSPF>RIP redistribution. This is really a aspect you must know simply by coronary heart so that they can generate your course redistribution successful!

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