Ospf - Tag - Fryguy's Blog

OSPF Router-ID and Traceoptions

Fryguy — Wed, 03 Apr 2013 13:55:03 +0000

Ok, time for some of the other things that we might do with OSPF. First up, router-ids. For this lab, we will create router-ids in the form of xx.xx.xx.xx where x=Router number. For example, R4 will be 44.44.44.44, and we won’t use a loopback interface for this.

First we can start with changing it on R4:

R4(config)#router ospf 1

R4(config-router)#router-id 44.44.44.44

Reload or use “clear ip ospf process” command, for this to take effect

So we have to clear the OSPF process in order for this to take effect.

R4(config-router)#^Z

R4#clear ip ospf process

Reset ALL OSPF processes? [no]: y

R4#

Ok, we should now have a Router-ID of 44.44.44.44.

R4#sh ip ospf | inc ID

Routing Process “ospf 1” with ID 44.44.44.44

Good. Time to recheck connectivity.

R4#ping 3.3.3.3 so lo 0

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 3.3.3.3, timeout is 2 seconds:

Packet sent with a source address of 4.4.4.4

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/4 ms

R4#

Good, we can still ping R3 from R4. Now, let’s do the same thing on J2.

Junos – OSPF and Rollback

Fryguy — Thu, 28 Feb 2013 17:11:10 +0000

This post continues off the previous JUNOS posts.

Ok, time to rollback to the rescue configs.

Up first replacing the config on R4 (if you have not done this in the last lab)

R4#configure replace flash:base.txt

Ok, that’s done – J1, J2, and J3 next.

First up, we need to roll-back to the rescue config. This is done from the edit mode by issuing the command rollback rescue.

jfry@J1> edit

Entering configuration mode

[edit]

jfry@J1# rollback rescue

load complete

[edit]

jfry@J1# commit and-quit

commit complete

Exiting configuration mode

jfry@J1>

Now to J2:

Junos – OSPF and Rollback

Fryguy — Thu, 07 Feb 2013 13:05:26 +0000

Ok, time for some OSPF and I will also cover Rollback (Love this feature) Here is our OSPF Topology, we will only do Single Area for this lab.

Ok, time to rollback to the rescue configs.

Up first replacing the config on R4 (if you have not done this in the last lab)

IOS XR – OSPF Configuration

Fryguy — Fri, 14 Sep 2012 13:22:03 +0000

Time for some OSPF configs, these will build off the previous configs we just did. For this lab, the other router, R2, was
preconfigured to support the connections.

We will place our loopback and out g0/3/0/2 interface into OSPF process LAB and area 0.0.0.0

RP/0/7/CPU0:R1#
RP/0/7/CPU0:R1#conf t
Thu Mar 29 19:37:52.671 UTC

Defineour OSPF process name
RP/0/7/CPU0:R1(config)#router ospf LAB

Now to define our area first
RP/0/7/CPU0:R1(config-ospf)#area 0.0.0.0

Now we can place the interfaces into the area, no need to entering subnets
RP/0/7/CPU0:R1(config-ospf-ar)#inter loo0
RP/0/7/CPU0:R1(config-ospf-ar-if)#inter g0/3/0/2
RP/0/7/CPU0:R1(config-ospf-ar-if)#exit
RP/0/7/CPU0:R1(config-ospf-ar)#exit
RP/0/7/CPU0:R1(config-ospf)#exit
RP/0/7/CPU0:R1(config)#commit

Thu Mar 29 19:38:15.182 UTC
RP/0/7/CPU0:R1(config)#

Now to look at our IP Protocols running:
RP/0/7/CPU0:R1#sh ip proto
Thu Mar 29 19:38:24.113 UTC
Routing Protocol OSPF LAB
Router Id: 1.1.1.1
Distance: 110
Non-Stop Forwarding: Disabled
Redistribution:
None
Area 0.0.0.0
Loopback0
GigabitEthernet0/3/0/2
RP/0/7/CPU0:R1#

DMVPN and Routing Protocols – OSPF

Fryguy — Thu, 04 Aug 2011 13:43:09 +0000

This post will build off my last one, DMVPN, and here we will discuss the routing protocol options as well as each of their configurations. I will break out each protocol into a separate post in order to help keep things straight, putting them all together has the potential to get confusing (for both you and me!). The routing protocol options I will document are OSPF, RIPv2, EIGRP, and BGP and each has some unique features and quirks, so I will try and point them out where necessary.
Quick note: When I am posting the configurations for the sites I will only notate the routing protocol additions. If you need information on DMVPN configuration, see my previous post.
Router/Switch Output
Commands
Notes
OSPF
What one needs to keep in mind here is that mGRE is a non-broadcast multi-access network (NBMA) how OSPF works. In order for OSPF to operate properly, the DMVPN hub router must be the OSPF DR and all the other routers should not be allowed to be a DR/BDR. The only way you could have a DR/BDR design if this was a multi-hub DMVPN network – and that is beyond the scope of this post (due to hardware limitation in my lab). Also, the mGRE tunnel on the hub router must be set to a OSPF broadcast network via the ip ospf network broadcast command.
So, let’s get on with the configuration – DMVPN Hub first.