ISDN backup link configuration and EIGRP redistribution - Part 2

While, route of backup link has been redistributed secussfully. Let's bring it on and see what will happen!

I pinged the fake ip address and debug message showed the backup link is on, oh wait a minute, the router 2 established neighbour adjacency with south router. I had feeling that something would be wrong.

Yes, the core switch rebooted! I believe it was caused by routing loop.

The more detailed network topology should be something like this:





So you can see the route loop was created if the backup link was brought up.

It is all the fault by ISP's BGP redistribution settings. They did it without routing filtering!

So the only solution is to configure passive interface:

router eigrp xx
passive-interface bri1/3

Now it is all done.

ISDN backup link configuration and EIGRP redistribution

Had a few days with ISDN backup link setup on a new Cisco 2821 router with 12.4(7) IOS.

It was quite easy to dump all the old configuration from old Cisco 4000 router (with IOS 11.2) with a few change - something like define the isdn switch-type since the new IOS doesn't have default value.


aaa authentication ppp default local
!
username southrouter password 7 xxxxxxxxxx
!
interface BRI1/3
description ISDN Backup to South Router
no ip address
encapsulation ppp
dialer pool-member 8
isdn switch-type basic-net3
isdn point-to-point-setup
no fair-queue
ppp authentication chap
!
interface Dialer8
description Link to South Router
bandwidth 1
ip address s.s.s.s.2 255.255.255.0
encapsulation ppp
delay 10000000
dialer pool 8
dialer remote-name southrouter
dialer idle-timeout 300
dialer enable-timeout 2
dialer string 5555555
dialer-group 10
ppp authentication chap
!
access-list 100 deny ip any host 255.255.255.255
access-list 100 deny eigrp any any
access-list 100 deny udp any any eq snmptrap
access-list 100 deny udp any any eq syslog
access-list 100 deny udp any any eq ntp
access-list 100 permit ip any any
dialer-list 10 protocol ip list 100
!


So far so good, ping the other end and link was brought up. Well done! the next step is to make a float static route and inject into eigrp. So I typed in

router eigrp 20
redistribute static

And another fake floating static route with the real one:
ip route 10.200.10.0 255.255.255.0 s.s.s.1 210

But in the core switch, this route didn't show up and neither with other real routes.

After about one hour's internet search, I found something intersting here:

When redistributing between different routing protocols, the default-metric com-mand must be configured. When one routing protocol is being redistributed into another, the router doesn't have a way to translate the routing metric from one routing protocol into another. The default-metric command is used so that the network administrator can manually initialize the routing metric during route redistribution.
(from: http://www.ciscopress.com/articles/article.asp?p=27839&seqNum=7)

Default Setting for EIGRP "default-metric" Command:

Only connected routes can be redistributed without a default metric. The metric of redistributed connected routes is set to 0.

(http://www.cisco.com/en/US/docs/ios/12_3t/ip_route/command/reference/ip2_c1gt.html#wp1094645)

After I typed in:
router eigrp 20
default-metric 64 20 255 1 1500

Guess what happened, the floating route is in RIB of core switch now!


TO BE CONTINUED...

Opinion: Microsoft-Lite (why anti-apple?)

Origin Link
http://www.itnews.com.au/News/NewsStory.aspx?story=80906

That is why I don't like apple.

By Ian Yates

22 July 2008 03:11PM
Tags: opinion | microsoftlite

What on earth has happened to Apple? The company is growing its market share according to the latest figures but it seems it can’t handle the extra numbers.

What was once a rock solid platform slowly drawing Windows users away from their endless crashing and patching routine has now become just a smaller version of its arch nemesis. Is this what has to happen when a computer company grows bigger?

Now we’re getting 500MB+ downloads from Apple when there’s a new revision of OS X, Mobile Me is just well….borked…. the company’s email has turned into silly putty, trying to sync turns your Mac into a go-slow zone, USB audio is right down the dunny, USB drives stop working until you update their firmware, MacBook Pros freeze when between open applications. Sure, you can also get this behaviour with Windows but at least the PC was cheaper to start with. Why pay more to get rogered?

And what does Apple say? No comment. Nada. Nix. Apple has taken a leaf out of the religious annals and thinks it is infallible. Problem with your Mac? Your iPhone? Your iPod? Oh no, never happens, it must be your fault. But hey, wait six months or so until umpteen thousand users have the same problem, and some hacker has posted a patch to fix the problem, and then, and only then, will Apple decide there might possibly be something wrong. And if they do decide to fix the bug, you still won’t get an apology.

And don’t get me started on the security side of things. Vista is looking a whole lot better than it used to, that’s for sure. Why have Microsoft-lite when you can get Microsoft full-cream for less money?