nanog mailing list archives
Re: Concerning MPLS paths
From: Marshall Eubanks <tme () americafree tv>
Date: Tue, 28 Apr 2009 05:13:05 -0400
On Apr 28, 2009, at 4:51 AM, Saqib Ilyas wrote:
Anyone? On Mon, Apr 27, 2009 at 6:15 PM, Saqib Ilyas <msaqib () gmail com> wrote:Furthermore, I was also wondering, if the bandwidth constraints are upper bounds, what does the traffic distribution typically look like at an LSR?
It clearly depends on what that traffic is.The MPLS services I am most familiar with carry video traffic, with traffic patterns that look very different from the typical web site (generally the traffic is either on or off, there is very little "burstiness," there can be long periods of basically full usage of the available bandwidth and, if you commit to X Mbps, you had better actually have it, not X - epsilon). I would guess that this is one end of the spectrum, that bursty web traffic is the other, and that most other uses (such as VOIP) fall somewhere in between.
Regards Marshall
We're interested in traffic within a single service provider, non- Internet traffic. Perhaps most service providers set aside some (dynamic?) pool for Internet traffic, while making commitments to customer's inter-site traffic.Thanks and best regards
On Mon, Apr 27, 2009 at 5:50 PM, Saqib Ilyas <msaqib () gmail com> wrote:WilliamThanks for the reply. You say that LSPs are not static unless you use TE tunnels. Are you referring to the staticness in terms of the path or in the amount of bandwidth reserved on each link along a fixed path determined at the time of signalling? Isn't a bandwidth constrained LSP always a TEtunnel? Thanks and best regards On Mon, Apr 27, 2009 at 5:41 PM, William McCall <william.mccall () gmail comwrote:Well, yes (if you don't count the additional traffic ofsignalling/routing protocols, label imposition, etc) but consider the fact that topologies change and routing will tend to change the total traffic handled through a node. LSPs are not static unless you use TE tunnels. Remember that labels are Forwarding Equivalency Classes and that translates into subnets (whether they're subnets in a L3 vpn or part of the P network)and the routing is still handled through an IGP or BGP. HTH --WJM IVOn Mon, Apr 27, 2009 at 7:10 AM, Saqib Ilyas <msaqib () gmail com> wrote:Hello everyoneIn the context of a single service provider network running MPLS, if a number of bandwidth constrained LSPs are passing through a particularnodeand the sum of the bandwidth constraints for the LSPs is X Mb/s, then isXthe upper bound on the traffic through that node, or is it sometimesexceeded as well? Thanks and best regards-- Muhammad Saqib Ilyas PhD Student, Computer Science and Engineering Lahore University of Management Sciences-- Muhammad Saqib Ilyas PhD Student, Computer Science and Engineering Lahore University of Management Sciences-- Muhammad Saqib Ilyas PhD Student, Computer Science and Engineering Lahore University of Management Sciences
Regards Marshall Eubanks CEO / AmericaFree.TV
Current thread:
- Concerning MPLS paths Saqib Ilyas (Apr 27)
- Re: Concerning MPLS paths William McCall (Apr 27)
- Re: Concerning MPLS paths Saqib Ilyas (Apr 27)
- Re: Concerning MPLS paths Saqib Ilyas (Apr 27)
- Re: Concerning MPLS paths Saqib Ilyas (Apr 28)
- Re: Concerning MPLS paths Marshall Eubanks (Apr 28)
- Re: Concerning MPLS paths Saqib Ilyas (Apr 27)
- Re: Concerning MPLS paths Saqib Ilyas (Apr 28)
- Re: Concerning MPLS paths William McCall (Apr 27)