MPLS Topology 1.0

On February 22, 2010, in CCIE, Dynamips, by Darren

I’m writing my MPLs exam soon and so I wanted to create lots of labs which run over an MPLS core. I was going to using my original ‘mad’ topology but it’s going to be a hassle to have to create the core each. I’ve instead decided to create a separate MPLS core that contains everything I’ll need.

There are 4 core routers, and 2 access routers. Customer routers are connected to the access routers. There is also a gateway router running BGP with ISP2 that will be for BGP and internet access testing. Note that although there is currently a BGP session between ISP2 and GR1, there are no other sessions yet.

The topology is designed so that when you start running it in dynamips, the core is already set up. i.e. MPLS and OSPF are already running. This is because it’s very easy to configure an MPLS core and 90% of your MPLS configuration work will be done on the access routers themselves. The core routers are just switching packets, that’s it.

This is the topology (click for the larger image):

MPLS Backbone small MPLS Topology 1.0

This is the .net file contents:

#MPLS 1.0 Topology created by Darren O'Connor 22/02/10
#www.mellowd.co.uk/ccie
#Feel free to use and change as you see fit. However if you do use please leave my details here at the top

[localhost:7200]

workingdir = /data/dynamips/working

[[3640]]
 image = /data/dynamips/IOS_Images/3640/c3640-jk9o3s-mz.124-5a.UNCOMPRESSED.bin
 ram = 128
 disk0 = 0
 disk1 = 0
 mmap = true
 ghostios = true

###########################
#                         #
# Mpls Topology           #
#                         #
###########################

 [[Router CR1]]
  model = 3640
  console = 2001
  autostart = true
  idlepc = 0x60610428
  slot0 = NM-1FE-TX
  slot1 = NM-4T
  slot2 = NM-1FE-TX
  s1/0 = AR1 s1/0
  s1/2 = AR3 s1/2
  Fa0/0 = CR3 Fa0/0
  Fa2/0 = CR2 Fa2/0
  cnfg = /data/dynamips/Topology/Topology_Config/mpls/CR1.cfg

 [[Router CR2]]
  model = 3640
  console = 2002
  autostart = true
  idlepc = 0x60610428
  slot0 = NM-1FE-TX
  slot1 = NM-4T
  slot2 = NM-1FE-TX
  s1/0 = AR2 s1/0
  s1/2 = AR1 s1/2
  Fa0/0 = CR4 Fa0/0
  cnfg = /data/dynamips/Topology/Topology_Config/mpls/CR2.cfg

 [[Router CR3]]
  model = 3640
  console = 2003
  autostart = true
  idlepc = 0x60610428
  slot0 = NM-1FE-TX
  slot1 = NM-4T
  slot2 = NM-1FE-TX
  Fa2/0 = CR4 Fa2/0
  s1/0 = AR3 s1/0
  s1/1 = GR1 s1/1
  s1/2 = AR4 s1/2
  cnfg = /data/dynamips/Topology/Topology_Config/mpls/CR3.cfg

 [[Router CR4]]
  model = 3640
  console = 2004
  autostart = true
  idlepc = 0x60610428
  slot0 = NM-1FE-TX
  slot1 = NM-4T
  slot2 = NM-1FE-TX
  s1/0 = AR4 s1/0
  s1/2 = AR2 s1/2
  cnfg = /data/dynamips/Topology/Topology_Config/mpls/CR4.cfg

 [[Router AR1]]
  model = 3640
  console = 2005
  autostart = true
  idlepc = 0x60610428
  slot0 = NM-1FE-TX
  slot1 = NM-4T
  slot2 = NM-1FE-TX
  Fa0/0 = CPE1 Fa0/0
  Fa2/0 = CPE2 Fa0/0
  cnfg = /data/dynamips/Topology/Topology_Config/mpls/AR1.cfg

 [[Router AR2]]
  model = 3640
  console = 2006
  autostart = true
  idlepc = 0x60610428
  slot0 = NM-1FE-TX
  slot1 = NM-4T
  slot2 = NM-1FE-TX
  Fa0/0 = CPE4 Fa0/0
  Fa2/0 = CPE3 Fa0/0
  cnfg = /data/dynamips/Topology/Topology_Config/mpls/AR2.cfg

 [[Router AR3]]
  model = 3640
  console = 2007
  autostart = true
  idlepc = 0x60610428
  slot0 = NM-1FE-TX
  slot1 = NM-4T
  slot2 = NM-1FE-TX
  Fa0/0 = CPE5 Fa0/0
  Fa2/0 = CPE6 Fa0/0
  cnfg = /data/dynamips/Topology/Topology_Config/mpls/AR3.cfg

 [[Router AR4]]
  model = 3640
  console = 2008
  autostart = true
  idlepc = 0x60610428
  slot0 = NM-1FE-TX
  slot1 = NM-4T
  slot2 = NM-1FE-TX
  Fa0/0 = CPE8 Fa0/0
  Fa2/0 = CPE7 Fa0/0
  cnfg = /data/dynamips/Topology/Topology_Config/mpls/AR4.cfg

 [[Router CPE1]]
  model = 3640
  console = 2009
  autostart = false
  idlepc = 0x60610428
  slot0 = NM-1FE-TX

 [[Router CPE2]]
  model = 3640
  console = 2010
  autostart = false
  idlepc = 0x60610428
  slot0 = NM-1FE-TX

 [[Router CPE3]]
  model = 3640
  console = 2011
  autostart = false
  idlepc = 0x60610428
  slot0 = NM-1FE-TX

 [[Router CPE4]]
  model = 3640
  console = 2012
  autostart = false
  idlepc = 0x60610428
  slot0 = NM-1FE-TX

 [[Router CPE5]]
  model = 3640
  console = 2013
  autostart = false
  idlepc = 0x60610428
  slot0 = NM-1FE-TX

 [[Router CPE6]]
  model = 3640
  console = 2014
  autostart = false
  idlepc = 0x60610428
  slot0 = NM-1FE-TX

 [[Router CPE7]]
  model = 3640
  console = 2021
  autostart = false
  idlepc = 0x60610428
  slot0 = NM-1FE-TX

 [[Router CPE8]]
  model = 3640
  console = 2022
  autostart = false
  idlepc = 0x60610428
  slot0 = NM-1FE-TX

 [[Router GR1]]
   model = 3640
   console = 2023
   autostart = true
   idlepc = 0x60610428
   slot0 = NM-1FE-TX
   slot1 = NM-4T
   Fa0/0 = ISP2 Fa0/0
   cnfg = /data/dynamips/Topology/Topology_Config/mpls/GR1.cfg

 [[Router ISP2]]
   model = 3640
   console = 2024
   autostart = true
   idlepc = 0x60610428
   slot0 = NM-1FE-TX
   cnfg = /data/dynamips/Topology/Topology_Config/mpls/ISP2.cfg

You can pick up the config files I’ve done over here: http://mellowd.co.uk/ccie/wp-content/uploads/2010/02/mpls.tar.gz

All my future MPLS labs will be done using this topology. Most config will be done on the access routers and the customer routers themselves.

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