MPLS – Traffic Eng (Dynamic quick sample)

MPLS traffic Engineering

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Basic Traffic engineering with MPLS-TE tunnels (Dynamic)

under the interface on every router that needs traffic engineering

- Enter Globally

mpls traffic-eng tunnels

- Under each interface that is involved

interface x/x
mpls traffic-eng tunnels
ip rsvp bandwidth

Head End configuration

interface Tunnel0
ip unnumbered Loopback0
tunnel destination 150.1.1.6
tunnel mode mpls traffic-eng
tunnel mpls traffic-eng autoroute announce
tunnel mpls traffic-eng path-option 1 dynamic
no routing dynamic

Important configuration is to point a route so traffic goes through the tunnel

- Static
- Dynamic
- PBR

Dynamic

tunnel mpls traffic-eng autoroute announce

Passed CCIE SP written – Now planning for Lab

All,

I finally had the time to take the CCIE SP written and have passed…Now I wil be more motivated to start labbing. Just to make sure I coould grab a seat before they got sold out I took Feb 24th 2011 and booked it. I will now start posting more as I study so prepare for alot of notes…

CCIE Lab $1000 soon????

so guys!! what is your take on the rumors going around that the lab will cost 1K soon? Some say it’s just a rumor and some say it’s for real… Guess we will have to wait and see

CCIE SP – Written

Guys,

I am gong to plan my written exam in a couple week out. Wish me luck!!!

I promise once I get this tet out of the way I will start blogging on a daily basis for my preperations with the SP Lab exam.

Good luck to everyone who is preparing.

Update ~ Its been a while

Sorry everyone. Its been a while since I posted. To start, here is whats new with me:

1.) I now work on the global WAN team for Walt Disney world
2.) Im still pursuing my SP CCIE
3.) I need to start studying more

My goal for this year is to atleast finish out my SP CCIE

I have been torn back and forth on what my next step should be. I have heard of all the rumors that the lab will change and now I do have a definite answer on the topic….”YES” there is going to be a new lab very soon!! (I cant tell you how I got this information)

So what this means for me is I need to start picking things up. I haven’t found much time till now because I have been so caught up with work, life balance….

The good thing is if the lab does change, I should at least have 6 months or so after they announce to finish up..

Hang in there with me…good luck to everyone pursuing the IE!

Im still alive!!!

Just wanted to let you guys know that I have been really busy with work and havnt had time to paste any updates. Im working on some cool stuff and will update this week. Keep you guys posted!!! Yes, Im still working towards SP lab!!

Interview with Roman from IeMentor

http://ccie12203.wordpress.com/author/ccie12203/

Visit this site for the interview with 6xCCIE

INE – VOL 1 – Service Provider

I starting going through the first couple mini-labs for SP and there pretty good. You have to read alot about the technologies while you go through them becuase they dont have much meat behind them, just tasks to accomplish. I havnt done my written exam yet becuase I have been lazy but I will keep everyone updated. I will get it done.

Still working on the SP Written!!!

Well Everyone, I have been really slow to start. Still not done with MPLS fundamentals book and still need to take the written. Work and Home life have been very busy but I will take my written before the end of this month. I do have some notes that I took on MPLS to share with you all. Happy labbing

MPLS Fundamentals – Chapter 2 notes

Here are my notes for Chapter 2 with MPLS Fundamentals.

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Chapter 2 – MPLS Architecture

LSR – Label switch router
LFIB – Label Forward information Base

MPLS – Where does it fit in the OSI model?

Layer 2.5 – Layer 2 and Layer 3 encapsulation are still present. The MPLS label is in between the packet

Label Switch router
Router that supports MPLS and is able to Switch labels

LSR types
Ingress LSR – Push
Egress LSR – Pop
Intermediate LSR – Swap

Label Switch Path – LSP
Group of LSR’s that switch labels throughout the MPLS network

Forward Equivalent class (FEC)
Group of packet that are forwarded along the same path and treated the same with regards to forwarding
- All packets that have the same FEC have the same label
- Not all packet have the same FEC since their EXP values, Thus the forwarding could be different.
- The router that decides which FEC belongs to which packet is the Ingress LSR (PE)

Examples of FEC

- Packets with layer 3 destination IP address matching a certain prefix
- Multicast packets belonging to a certain group
- Packets with the same forwarding treatment
- Layer 2 frames carried across a MPLS network received on one VC (or sub interface) on the ingress LSR and transmitted on on e VC on the egress LSR
- Packets with layer 3 destination IP address that belong to a set of BGP prefixes, all with the same BGP next hop

All packets that belong to the same FEC get the same label imposted by the ingress LSR

Label Distribution

LDP – IETF version

- Used to distribute Labe to IP prefix information to its neighbors
- Each neighbor keeps these bindings inside its LFIB – Label forwarding information base

MPLS label spaces – More notes later (per interface or per prefix)

RIB – routing information base (routing table) stores next-hop for IP prefixes

Once this information is passed along the LSR can label packets based of the IPv4 prefixes.

- Each downstream neighbor distribute its label binding information

Label is locally significant
dfsa

LFIB – Used to forward labeled packets. It is populated with the incoming and outgoing labels for the LSP

Incoming label – from its local binding
Outgoing label – From the remote LSR

The LIB (label information base) – All the remote binding
- Only one Remote binding is chosen and placed into the LFIB

- LFIB is always used to forward an incoming labeled packet

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Different MPLS modes

- Label Distribution mode
- Label retention mode
- LSP control mode

Label Distribution Modes
- Downstream on Demand (DoD) label distribution mode
- Unsolicited Downstream (UD) label distribution mode

DoD – Each LSR request its next hop (downstream) LSR on an LSP, label binding for that FEC (BGP pi routing table)

UD – each LSR distributes a binding to its adjacent LSR, without this LSR requesting a label

All the interfaces except ATM , used the UD mode.

Label retention mode
- LLR (Liberal label retention) – Keeps track of all remote bindings in the LIB. Only one binding is used to forward form the LFIB. If there is a change than it has the binding already in the FIB stored.

LSP Control modes
- Independent LSP control mode (Cisco IOS uses this unless ATM)

LSR creates local binding for a FEC independently from the other LSR as soon as it recognizes the FEC

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Summary

- Label stack sits in front of the transported packet. If the packet is IP packet the label stack is behind the layer 2 header but before the IP header (layer 3)

LIB and LFIB

LIB – stores the label bindings
LFIB – lookup table to forward label packets