[6bone] [NOTIFY] XS26 service/peering outage

[John Fraizer]

On Tue, 17 Dec 2002, Pekka Savola wrote:

> On Tue, 17 Dec 2002, Jesper Skriver wrote:
> [...]
> > That is easily doable on a dial or DSL aggregation router ...
> > 
> > We have several boxes with more than 5000 interfaces.
> 
> When a link goes up/down on one of those interfaces, does it trigger an 
> IGP/EGP event?
> 
> Thought so... :-)
> 
> -- 
> Pekka Savola                 "Tell me of difficulties surmounted,


In most cases, no.

Think about it.  Why on earth would you want to carry 5000 prefixes in
your IGP/EGP when a single aggregate for each router will do?

Why on earth, beyond the possibility of a BGP peer at the end of one of
those DSL terminations (people do that?) would that effect your EGP?

You don't really carry those specifics in BGP do you?  If so, for what
reason?  If they're in your IGP, they're in your routing table.  There is
no reason to carry them in the EGP.

IMHO, if you didn't learn it from a BGP peer or didn't originate it with a
"network" statement in your BGP config, it doesn't belong in BGP.  BGP !=
IGP.


So, explain to me again why you are carrying all of those prefixes in:

(1) IGP when a single aggregate for the router "block" will do.

(2) EGP (BGP)

I understand the having many, many interfaces will be the norm for tunnel
brokers, DSLAMs, etc.  Having many, many IGP prefixes and thrash as result
of those many many interfaces is NOT a requirement though, if you _design_
your network appropriately for the task you are requireing of it. 


---
John Fraizer              | High-Security Datacenter Services |
President                 | Dedicated circuits 64k - 155M OC3 |
EnterZone, Inc            | Virtual, Dedicated, Colocation    |
http://www.enterzone.net/ | Network Consulting Services       |