Third and last BGP lab for today. This one mainly concerns peer-groups, though there is a bit of as_path access lists thrown in as well. Topology used is over here: http://mellowd.co.uk/ccie/?p=243
BGP Lab 5:
- Create a peer group in AS950 so you don’t have to do the same configuration for R2, R9 and R8 all the time
- Ensure R8, R9 and R2 all use R1 as the next hop when leaving the AS
- Use loopbacks in AS950 for iBGP peerings
- Create an AS_PATH access list so that AS60 and AS70 don’t use AS950 as transit, however all routers in AS950 should be able to ping all routers
Click on the thumbnail for the full size image
I noticed a few mistakes in my previous topology. Namely I had no routers with more than 1 connection to each other. This is essential for a number of tests. I’ve re-done the topology now. Look closely at Router’s 7 and 14 – There is a new interface connecting them. This time I’ll upload my IP addressing scheme as well as my config files. You’ll need to customise the settings and idlepc values for yourself.
Once again you’ll need to click the picture for the full picture.
This is my .net file:
#Topology created by Darren O'Connor #www.mellowd.co.uk/ccie [localhost:7200] workingdir = /data/dynamips/working [[3745]] image = /data/dynamips/IOS_Images/3745/c3745-adventerprisek9-mz.124-25b.UNCOMPRESSED.bin ram = 128 disk0 = 16 disk1 = 0 mmap = true ghostios = true ########################### # # # Mad Topology # # # ########################### [[Router R1]] model = 3745 console = 2001 autostart = false idlepc = 0x61239894 slot1 = NM-4T s1/0 = F1 1 s1/1 = R6 s1/1 s1/2 = R8 s1/2 s1/3 = R2 s1/3 Fa0/0 = R9 F0/1 cnfg = /data/dynamips/Topology/Topology_Config/R1.cfg [[Router R2]] model = 3745 console = 2002 autostart = false idlepc = 0x61239894 slot1 = NM-4T s1/0 = F1 2 Fa0/1 = R8 Fa0/0 s1/2 = R9 s1/2 s1/1 = R3 s1/3 Fa0/0 = R10 Fa0/1 cnfg = /data/dynamips/Topology/Topology_Config/R2.cfg [[Router R3]] model = 3745 console = 2003 autostart = false idlepc = 0x61239894 slot1 = NM-4T s1/0 = F1 3 Fa0/1 = R9 Fa0/0 s1/2 = R10 s1/2 Fa0/0 = R11 Fa0/1 s1/1 = R4 s1/3 cnfg = /data/dynamips/Topology/Topology_Config/R3.cfg [[Router R4]] model = 3745 console = 2004 autostart = false idlepc = 0x61239894 slot1 = NM-4T s1/0 = F1 4 Fa0/1 = R10 Fa0/0 s1/2 = R11 s1/2 Fa0/0 = R12 Fa0/1 s1/1 = R5 s1/3 cnfg = /data/dynamips/Topology/Topology_Config/R4.cfg [[Router R5]] model = 3745 console = 2005 autostart = false idlepc = 0x61239894 slot1 = NM-4T s1/0 = F1 5 Fa0/1 = R11 Fa0/0 s1/2 = R12 s1/2 cnfg = /data/dynamips/Topology/Topology_Config/R5.cfg [[Router R6]] model = 3745 console = 2006 autostart = false idlepc = 0x61239894 slot1 = NM-4T s1/0 = F1 6 s1/2 = R13 s1/2 Fa0/0 = R14 Fa0/1 s1/3 = R7 s1/3 cnfg = /data/dynamips/Topology/Topology_Config/R6.cfg [[Router R7]] model = 3745 console = 2007 autostart = false idlepc = 0x61239894 slot1 = NM-4T slot2 = NM-1FE-TX s1/0 = F1 7 Fa0/1 = R13 Fa0/0 s1/2 = R14 s1/2 Fa0/0 = SW2 Fa1/7 fa2/0 = R14 fa2/0 cnfg = /data/dynamips/Topology/Topology_Config/R7.cfg [[Router R8]] model = 3745 console = 2008 autostart = false idlepc = 0x61239894 slot1 = NM-4T slot2 = NM-1FE-TX s1/3 = R9 s1/3 Fa2/0 = SW1 Fa1/8 cnfg = /data/dynamips/Topology/Topology_Config/R8.cfg [[Router R9]] model = 3745 console = 2009 autostart = false idlepc = 0x61239894 slot1 = NM-4T slot2 = NM-1FE-TX s1/1 = R10 s1/3 Fa2/0 = SW1 Fa1/9 cnfg = /data/dynamips/Topology/Topology_Config/R9.cfg [[Router R10]] model = 3745 console = 2010 autostart = false idlepc = 0x61239894 slot1 = NM-4T slot2 = NM-1FE-TX s1/1 = R11 s1/3 Fa2/0 = SW1 Fa1/10 cnfg = /data/dynamips/Topology/Topology_Config/R10.cfg [[Router R11]] model = 3745 console = 2011 autostart = false idlepc = 0x61239894 slot1 = NM-4T slot2 = NM-1FE-TX s1/1 = R12 s1/3 Fa2/0 = SW1 Fa1/11 cnfg = /data/dynamips/Topology/Topology_Config/R11.cfg [[Router R12]] model = 3745 console = 2012 autostart = false idlepc = 0x61239894 slot1 = NM-4T slot2 = NM-1FE-TX Fa2/0 = SW1 Fa1/12 cnfg = /data/dynamips/Topology/Topology_Config/R12.cfg [[Router R13]] model = 3745 console = 2013 autostart = false idlepc = 0x61239894 slot1 = NM-4T s1/3 = R14 s1/3 cnfg = /data/dynamips/Topology/Topology_Config/R13.cfg [[Router R14]] model = 3745 console = 2014 autostart = false idlepc = 0x61239894 slot1 = NM-4T slot2 = NM-1FE-TX Fa0/0 = SW2 Fa1/14 cnfg = /data/dynamips/Topology/Topology_Config/R14.cfg [[Router SW1]] model = 3745 console = 2021 autostart = false idlepc = 0x61239894 slot1 = NM-16ESW Fa0/0 = SW2 Fa0/0 cnfg = /data/dynamips/Topology/Topology_Config/SW1.cfg [[Router SW2]] model = 3745 console = 2022 autostart = false idlepc = 0x61239894 slot1 = NM-16ESW cnfg = /data/dynamips/Topology/Topology_Config/SW2.cfg [[FRSW F1]] 1:102 = 2:201 1:103 = 3:301 1:104 = 4:401 1:105 = 5:501 1:106 = 6:601 1:107 = 7:701 2:203 = 3:302 2:204 = 4:402 2:205 = 5:502 2:206 = 6:602 2:207 = 7:702 3:304 = 4:403 3:305 = 5:503 3:306 = 6:603 3:307 = 7:703 4:405 = 5:504 4:406 = 6:604 4:407 = 7:704 5:506 = 6:605 5:507 = 7:705 6:607 = 7:706
Here is my .pdf file which contains my IP addressing scheme. You can see that most links are /30 point to point links, but there are a few /24′s as well where more than 2 routers connect in the same broadcast domain. Click here for the topology
Thankfully you won’t have to put this info in every time, as it’s already saved in my configuration files which are auto loaded. Download the configuration files here
Now it’s up to you to create labs based on this topology. I’ve got a number of ideas for BGP as that’s what I’m studying now, so stay tuned!
This has taken me absolutely hours to finally finish. I wanted to create a topology that I’ll be able to run all kind of different labs on. i.e. the topology is extremely complex. I’ve configured all the connections through my .net file as well as saving base configs (hostname and IP addresses) so I don’t have to put these in each time I load up my .net file.
This is the topology itself. You need to click the picture to get the full picture.
My .net file is pretty much configured like so:
#Topology created by Darren O'Connor #www.mellowd.co.uk/ccie [localhost:7200] workingdir = /data/dynamips/working [[3745]] image = /data/dynamips/IOS_Images/3745/c3745-adventerprisek9-mz.124-25b.UNCOMPRESSED.bin ram = 128 disk0 = 16 disk1 = 0 mmap = true ghostios = true ########################### # # # Mad Topology # # # ########################### [[Router R1]] model = 3745 console = 2001 autostart = false idlepc = 0x61239894 slot1 = NM-4T s1/0 = F1 1 s1/1 = R6 s1/1 s1/2 = R8 s1/2 s1/3 = R2 s1/3 Fa0/0 = R9 F0/1 cnfg = /data/dynamips/Topology/Topology_Config/R1.cfg [[Router R2]] model = 3745 console = 2002 autostart = false idlepc = 0x61239894 slot1 = NM-4T s1/0 = F1 2 Fa0/1 = R8 Fa0/0 s1/2 = R9 s1/2 s1/1 = R3 s1/3 Fa0/0 = R10 Fa0/1 cnfg = /data/dynamips/Topology/Topology_Config/R2.cfg [[Router R3]] model = 3745 console = 2003 autostart = false idlepc = 0x61239894 slot1 = NM-4T s1/0 = F1 3 Fa0/1 = R9 Fa0/0 s1/2 = R10 s1/2 Fa0/0 = R11 Fa0/1 s1/1 = R4 s1/3 cnfg = /data/dynamips/Topology/Topology_Config/R3.cfg [[Router R4]] model = 3745 console = 2004 autostart = false idlepc = 0x61239894 slot1 = NM-4T s1/0 = F1 4 Fa0/1 = R10 Fa0/0 s1/2 = R11 s1/2 Fa0/0 = R12 Fa0/1 s1/1 = R5 s1/3 cnfg = /data/dynamips/Topology/Topology_Config/R4.cfg [[Router R5]] model = 3745 console = 2005 autostart = false idlepc = 0x61239894 slot1 = NM-4T s1/0 = F1 5 Fa0/1 = R11 Fa0/0 s1/2 = R12 s1/2 cnfg = /data/dynamips/Topology/Topology_Config/R5.cfg [[Router R6]] model = 3745 console = 2006 autostart = false idlepc = 0x61239894 slot1 = NM-4T s1/0 = F1 6 s1/2 = R13 s1/2 Fa0/0 = R14 Fa0/1 s1/3 = R7 s1/3 cnfg = /data/dynamips/Topology/Topology_Config/R6.cfg [[Router R7]] model = 3745 console = 2007 autostart = false idlepc = 0x61239894 slot1 = NM-4T s1/0 = F1 7 Fa0/1 = R13 Fa0/0 s1/2 = R14 s1/2 Fa0/0 = SW2 Fa1/7 cnfg = /data/dynamips/Topology/Topology_Config/R7.cfg [[Router R8]] model = 3745 console = 2008 autostart = false idlepc = 0x61239894 slot1 = NM-4T slot2 = NM-1FE-TX s1/3 = R9 s1/3 Fa2/0 = SW1 Fa1/8 cnfg = /data/dynamips/Topology/Topology_Config/R8.cfg [[Router R9]] model = 3745 console = 2009 autostart = false idlepc = 0x61239894 slot1 = NM-4T slot2 = NM-1FE-TX s1/1 = R10 s1/3 Fa2/0 = SW1 Fa1/9 cnfg = /data/dynamips/Topology/Topology_Config/R9.cfg [[Router R10]] model = 3745 console = 2010 autostart = false idlepc = 0x61239894 slot1 = NM-4T slot2 = NM-1FE-TX s1/1 = R11 s1/3 Fa2/0 = SW1 Fa1/10 cnfg = /data/dynamips/Topology/Topology_Config/R10.cfg [[Router R11]] model = 3745 console = 2011 autostart = false idlepc = 0x61239894 slot1 = NM-4T slot2 = NM-1FE-TX s1/1 = R12 s1/3 Fa2/0 = SW1 Fa1/11 cnfg = /data/dynamips/Topology/Topology_Config/R11.cfg [[Router R12]] model = 3745 console = 2012 autostart = false idlepc = 0x61239894 slot1 = NM-4T slot2 = NM-1FE-TX Fa2/0 = SW1 Fa1/12 cnfg = /data/dynamips/Topology/Topology_Config/R12.cfg [[Router R13]] model = 3745 console = 2013 autostart = false idlepc = 0x61239894 slot1 = NM-4T s1/3 = R14 s1/3 cnfg = /data/dynamips/Topology/Topology_Config/R13.cfg [[Router R14]] model = 3745 console = 2014 autostart = false idlepc = 0x61239894 slot1 = NM-4T Fa0/0 = SW2 Fa1/14 cnfg = /data/dynamips/Topology/Topology_Config/R14.cfg [[Router SW1]] model = 3745 console = 2021 autostart = false idlepc = 0x61239894 slot1 = NM-16ESW Fa0/0 = SW2 Fa0/0 cnfg = /data/dynamips/Topology/Topology_Config/SW1.cfg [[Router SW2]] model = 3745 console = 2022 autostart = false idlepc = 0x61239894 slot1 = NM-16ESW cnfg = /data/dynamips/Topology/Topology_Config/SW2.cfg [[FRSW F1]] 1:102 = 2:201 1:103 = 3:301 1:104 = 4:401 1:105 = 5:501 1:106 = 6:601 1:107 = 7:701 2:203 = 3:302 2:204 = 4:402 2:205 = 5:502 2:206 = 6:602 2:207 = 7:702 3:304 = 4:403 3:305 = 5:503 3:306 = 6:603 3:307 = 7:703 4:405 = 5:504 4:406 = 6:604 4:407 = 7:704 5:506 = 6:605 5:507 = 7:705 6:607 = 7:706
The actual IP config files are separate. If you want them feel free to ask
Now tht I’ve got my basic configuration up, we now need to set idlepc values for dynamips. If you load up even just 1 router without doing this, you’ll end up with 100% CPU usage. As an added bonus I’ve measured power draw from the wall just to see exactly how much power this set up pulls.
At idle my server pulls exactly 75watts.
I’ve now loaded up dynamips/dynagen with 20 router instances with NO idlepc values set and this is the result:
$top Tasks: 109 total, 2 running, 106 sleeping, 1 stopped, 0 zombie Cpu(s): 99.8%us, 0.2%sy, 0.0%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 3996956k total, 3014956k used, 982000k free, 5576k buffers Swap: 7960168k total, 0k used, 7960168k free, 1563492k cached
As you can see I’m sitting on 99.8% CPU usage. These are the routers running:
=> list Name Type State Server Console R1 3745 running localhost:7200 2001 R2 3745 running localhost:7200 2002 R3 3745 running localhost:7200 2003 R4 3745 running localhost:7200 2004 R5 3745 running localhost:7200 2005 R6 3745 running localhost:7200 2006 R7 3745 running localhost:7200 2007 R8 3745 running localhost:7200 2008 R9 3745 running localhost:7200 2009 R10 3745 running localhost:7200 2010 R11 3745 running localhost:7200 2011 R12 3745 running localhost:7200 2012 R13 3745 running localhost:7200 2013 R14 3745 running localhost:7200 2014 R15 3745 running localhost:7200 2015 R16 3745 running localhost:7200 2016 R17 3745 running localhost:7200 2017 R18 3745 running localhost:7200 2018 R19 3745 running localhost:7200 2019 R20 3745 running localhost:7200 2020
I’m now pulling a total of 160watts from the wall.
In order to get my idlepc value I do this:
=> idlepc get R2 Please wait while gathering statistics... Please wait while gathering statistics... Done. Suggested idling PC: 0x61239894 (count=55) 0x604ebf00 (count=31) 0x60aacff8 (count=41) 0x60aad000 (count=23) 0x6123552c (count=72) 0x6123558c (count=65) 0x612355d4 (count=22) 0x60aa6490 (count=34) 0x60aa64c0 (count=29) 0x60aa6694 (count=33) Restart the emulator with "--idle-pc=0x61239894" (for example) * 1: 0x61239894 [55] 2: 0x604ebf00 [31] 3: 0x60aacff8 [41] 4: 0x60aad000 [23] 5: 0x6123552c [72] 6: 0x6123558c [65] 7: 0x612355d4 [22] 8: 0x60aa6490 [34] 9: 0x60aa64c0 [29] 10: 0x60aa6694 [33] Potentially better idlepc values marked with "*" Enter the number of the idlepc value to apply [1-10] or ENTER for no change: 1 Applied idlepc value 0x61239894 to R2
I’ve now applied an idlepc value to R2, but I need this replicated across all routers. This isn’t a problem as all my routers are the same type. All I need to do is this:
=> idlepc copy R2 /all R4: idlepc set to 0x61239894 R5: idlepc set to 0x61239894 R6: idlepc set to 0x61239894 R7: idlepc set to 0x61239894 R12: idlepc set to 0x61239894 R1: idlepc set to 0x61239894 R3: idlepc set to 0x61239894 R20: idlepc set to 0x61239894 R11: idlepc set to 0x61239894 R8: idlepc set to 0x61239894 R9: idlepc set to 0x61239894 R18: idlepc set to 0x61239894 R10: idlepc set to 0x61239894 R15: idlepc set to 0x61239894 R14: idlepc set to 0x61239894 R17: idlepc set to 0x61239894 R16: idlepc set to 0x61239894 R19: idlepc set to 0x61239894 R13: idlepc set to 0x61239894
You can do this for every router type. In other words, if I had 2 different router types, I’d have to do these commands for each type and then copy the values.
My CPU usage has now jumped down, while still running 20 routers:
Tasks: 109 total, 2 running, 106 sleeping, 1 stopped, 0 zombie Cpu(s): 64.8%us, 0.0%sy, 0.0%ni, 35.2%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 3996956k total, 3053568k used, 943388k free, 7524k buffers Swap: 7960168k total, 0k used, 7960168k free, 1591900k cached
Power draw at the wall has jumped down to 94Watts. Quite a big saving on juice!
In order to save yourself from having to do this each time, you can just save the idlepc values in your .net file. This means that when you load up your routers, it’ll apply the idlepc value straight away. Do it like so in your .net file:
[[Router R1]] model = 3745 console = 2001 autostart = false idlepc = 0x61239894 [[Router R2]] model = 3745 console = 2002 autostart = false idlepc = 0x61239894
Note. Do NOT use my values. See what works for you. Use a few different ones and see what happens. Once I’ve actually got protocols running in my lab I’m sure I’ll need to change these values, so please do this for yourself as well.
So now the case and 4GB ram I ordered has arrived. It’s pretty late now and I’m off tomorrow so I’ll be building this box tomorrow. I’ve got to say, these RAM chips are the shortest I’ve seen yet excluding SODIMM’s. I almost thought I had the wrong type.
Tomorrow I’ll put it together and install CentOS 5.3 I then have the fun of trying to get this wireless card working and then dynamips and dynagen installed and working.
I’ll also spend a bit of time configuring dynamips to run over all 4 CPU’s. I wonder how it’ll all run.
I’ll update this post as well with a few pictures tomorrow
*tomorrow*
I didn’t want to create a new post just for this. I’ve put it al together and thought I had a spare video card lying around. Turns out I don’t. I just need it so I can install linux, it’ll come out straight after. I’ve ordered an old ati x300 on ebay, let’s hope it gets here quick!
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