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Author Topic: IPv6 IGP Routing protocols  (Read 5854 times)

jimb

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IPv6 IGP Routing protocols
« on: May 05, 2011, 01:36:17 AM »

I'm curious what IGPs people are running out there in dual-stack land.  What is HE using for an IGP?

The only real choices are OSPFv3 and IS-IS for a dual-stack environment, right?  

I've noticed a lot of people talking about IS-IS lately.

I played around with it a bit using GNS3 and found it pretty easy to set up once I figured out that you had to set a unique OSI NSAP on each router for it to communicate and identify itself to other routers.  Once that was set up, all I really had to do was turn on IS-IS on each interface (here's a snippet):

interface Serial0/0
 bandwidth 64
 ip address 192.168.10.1 255.255.255.252
 ip router isis
 ipv6 address 2001:DB8:10::1/127
 ipv6 router isis

router isis
 net 49.0001.0100.0100.1001.00
 metric-style wide
 log-adjacency-changes
 default-information originate

(yes I was playing with /127s for serial p-t-p interfaces)

The NSAP is the "49.0001.0100.0100.1001.00" part (google NSAP if curious).

The neat thing is that IS-IS can carry data for both IP and IPv6 in a rather transparent manner.  You just set up the router section, then tell it to route ip and ipv6 with the "ip/ipv6 router isis" statements on each interface.
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SomeJoe7777

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Re: IPv6 IGP Routing protocols
« Reply #1 on: May 07, 2011, 09:50:03 PM »

I'm currently running dual-stack in a small WAN network involving 4 routers.  I'm using OSPF v2 for IPv4 IGP, and OSPF v3 for IPv6 IGP.  It seems to work rather well.

I've always preferred OSPF over IS-IS, but that's probably just personal preference because I've dealt with OSPF for many years and I know how it works.
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jimb

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Re: IPv6 IGP Routing protocols
« Reply #2 on: May 08, 2011, 03:21:27 PM »

Yeh I set up a OSPFv2/v3 experiment also.  Was pretty simple to set up one I figured out that you have to use "ipv6 router" statements to set it up per interface rather than a normal "router" section with network statements.  Although "default-information originate" is done in a ipv6 router section.
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