June 2007
Intermediate to advanced
600 pages
18h 19m
English
Content preview from Network Warrior
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GRE Tunnels and Routing Protocols
The introduction of a routing protocol across a GRE tunnel can cause some interesting
problems. Take, for example, our network, now altered as shown in Figure 12-3. This time we have the links between the routers
updating routes using RIPv2. The other interfaces on Router A and Router D are included in
RIP using the redistribute connected command. EIGRP is
running on all interfaces on Routers A and D with the exception of the serial links, which
are running RIPv2.
Figure 12-3. Recursive routing example
While this may look a bit odd, consider the possibility that the Routers B and C are owned and operated by a service provider. We cannot control them, and they only run RIPv2. We run EIGRP on our routers (A and D) and want to route between them using EIGRP.
Here are the pertinent configurations for Router A and Router D (remember, in this scenario, Routers B and C are beyond our control):
Router A:
interface Loopback0 ip address 10.100.100.100 255.255.255.255 ! interface Tunnel0 ip address 172.16.0.1 255.255.255.0 tunnel source Loopback0 tunnel destination 10.200.200.200 ! interface Ethernet0/1 ip address 10.10.10.1 255.255.255.0 ! interface Serial0/1 ip address 192.168.1.1 255.255.255.0 router eigrp 100 network 10.10.10.0 0.0.0.255 network 10.100.100.0 0.0.0.255 network 172.16.0.0 0.0.0.255 no auto-summary ! router rip version 2 redistribute connected passive-interface ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.