Grats man, a different route from a different source, due to the different routes having different metrics. Nice to see that Cisco Network Academy lesson one is actually true.
Dynamic protocol running routers will take the most efficient path, including BGP even though they have different measures of this. Also modifications of such fields as MED, local preference, AS Prepending, metric, origin, etc, in route maps can be used to manipulate traffic.
I think your point is that ntl have some transit and peering links that are congested yes? The first trace you posted supports this nicely without the need for the other stuff after it.
If all areas were routed the same way there would be no resiliency, it's like saying that every car that wants to go from x to x absolutely has to go down this B road even though there's a dual carriageway and a motorway also, pointless.
Basic dynamic routing, what you appeared to think was the case implied static routing which is absolutely not an option on a network with hundreds of routers.
---------- Post added at 21:49 ---------- Previous post was at 21:46 ----------
Quote:
|
Originally Posted by Chrysalis
Appears no problem, can someone in the south of england trace us.logon.worldofwarcraft.com please that was the target he traced so can see if the routing is indeed different, this could explain the hige differences in performances different areas appear to have.
---------- Post added at 21:04 ---------- Previous post was at 21:01 ----------
ip 12.129.232.116 as it is a pool of ip's I want to make sure same destination.
|
Ummm
Addresses: 12.129.232.109, 12.129.232.110, 12.129.232.111, 12.129.232.112
12.129.232.113, 12.129.232.114, 12.129.232.115, 12.129.232.116
Somehow I don't think that 8 consecutive IPs on the other side of the world will have different routes to them, otherwise the full route table would be just a tad larger than the 240,000 or so routes it is currently. (Hint it's called summarisation, the summarising of several smaller networks into a larger network / subnet called a supernet
)
Quote:
|
Originally Posted by Opentransit Looking Glass
BGP routing table entry for 12.128.0.0/9, version 116504303
Paths: (2 available, best #1)
Advertised to update-groups:
19
7018
192.205.32.137 (metric 40) from 193.251.245.90 (193.251.245.90)
Origin IGP, metric 100, localpref 85, valid, internal, best
Community: 5511:666 5511:700
Originator: 193.251.245.8, Cluster list: 0.0.0.110, 0.0.0.120
7018
192.205.32.137 (metric 40) from 193.251.245.92 (193.251.245.92)
Origin IGP, metric 100, localpref 85, valid, internal
Community: 5511:666 5511:700
Originator: 193.251.245.8, Cluster list: 0.0.0.110, 0.0.0.120
|
Opentransit see all IPs between 12.128.0.0 and 12.255.0.0 as a single network. Looking glasses are a nice source of info