iPhone

Inter-AS Option B – Revisited

Consider the topology below.

Watch the video below or download and watch it on your iphone.

Frame-Relay to VLAN Interworking – AToM

Consider the topology below.

Watch the video below or download and watch it on your ipod or iphone.
The commands used in the above video can be found below.
PE1
!
hostname PE1
!
frame-relay switching
!
mpls ldp router-id Loopback0 force
mpls label protocol ldp
!
pseudowire-class ZARAR
encapsulation mpls
interworking ip
!
interface Loopback0
ip address 1.1.1.1 255.255.255.255
!
interface FastEthernet1/0
ip address 10.0.0.1 255.255.255.252
mpls ip
!
interface Serial2/0
no ip address
encapsulation frame-relay
clockrate 128000
frame-relay interface-dlci 110 [...]

6PE – IPv6 over MPLS

6PE is a really cool feature which allows IPv6 islands to communicate with each other over an MPLS/IPv4 core network.  IPv4 addresses space is fast running out so familiarising yourself with IPv6 is probably a good idea.
Consider the toplogy below.

Service providers can leverage their MPLS networks to deliver IPv6 solutions without having to rearchitect their [...]

BGP – Remove Private AS

The video below shows how to remove a private AS from BGP as-path list.
Consider the topology below.
AS65300 peers eBGP with R1.  R1 then peers eBGP with R2.
R1 is then configured to remove all private ASs in the as-path when it advertises BGP routes to R2.
Watch the video below or download and watch it on your [...]

OSPF down bit and domain tag

Both the OSPF down bit and domain tag are modifications in OSPF which are used as loop prevention mechanisms.  Why are there two mechanisms you ask.  This is because type 5 LSAs do not contain the options field in the header.  The options field is where the down bit is set.  In LSA type 5 [...]

Controlling MPLS Label Distribution – Video

I was looking through my archives to remember how to configure “controlling label distribution” and realised that I had not not made a video for this subject, so here goes.
Consider the topology below.

As we all know, LDP assigns a Label for each IGP prefix and connected route in the RIB.  Therefore when we use the [...]

eBGP multihop

eBGP multihop can be used to loadshare traffic across multiple links between eBGP peers.
Consider the topology below.

By default eBGP sessions can only be established between directly connected interfaces.  If you want to connect to a non-connected interface or to a non-connected neighbor, you have to use the eBGP-multihop feature.
For this to work, you need to [...]