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MPLS labelling for eBGP routes

February 17, 2015, 2:44 am
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Hi all,

Just playing around with a similar "simple" MPLS configuration, basically, copying Brian's configs in the ATC video.

 

Setup:

R1-R8 (AS100) - CORE with R7/R8 being the PE (one foot in MPLS, one foot in eBGP!)

R9 (AS9) - external

R10 (AS10) - external

eBGP R8-R10, eBGP R7-R9

Configured "mpls ldp autoconfig" on all internal/core router.

Created some dummy loopbacks on R9/R10 to generate some router.

 

Issue (or not):

I can see all of the internal/core prefix & loopbacks with associated labels (show mpls forw), but cannot see any of the prefixes/labels of the external eBGP routes from R9/R10.... however, routing works perfectly between AS9 and AS10... so it's working!

 

R7#sh mpls fo

Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop

Label      Label      or Tunnel Id     Switched      interface

16         Pop Label  150.1.6.6/32     0             Et0/1.67   155.1.67.6

17         Pop Label  155.1.146.0/24   0             Et0/1.67   155.1.67.6

18         20         155.1.0.5/32     0             Et0/1.67   155.1.67.6

19         21         155.1.0.4/32     0             Et0/1.67   155.1.67.6

20         No Label   155.1.0.3/32     0             Et0/1.37   155.1.37.3

21         18         155.1.0.1/32     0             Et0/1.37   155.1.37.3

           23         155.1.0.1/32     0             Et0/1.67   155.1.67.6

22         24         150.1.8.8/32     0             Et0/1.67   155.1.67.6

23         25         150.1.5.5/32     0             Et0/1.67   155.1.67.6

24         26         150.1.4.4/32     0             Et0/1.67   155.1.67.6

25         Pop Label  150.1.3.3/32     0             Et0/1.37   155.1.37.3

26         26         150.1.2.2/32     0             Et0/1.37   155.1.37.3

27         21         150.1.1.1/32     0             Et0/1.37   155.1.37.3

           29         150.1.1.1/32     0             Et0/1.67   155.1.67.6

28         30         155.1.108.0/24   0             Et0/1.67   155.1.67.6

29         31         155.1.8.0/24     0             Et0/1.67   155.1.67.6

30         32         155.1.5.0/24     0             Et0/1.67   155.1.67.6

31         34         155.1.58.0/24    0             Et0/1.67   155.1.67.6

32         36         155.1.45.0/24    0             Et0/1.67   155.1.67.6

33         Pop Label  155.1.23.0/24    0             Et0/1.37   155.1.37.3

34         Pop Label  155.1.13.0/24    0             Et0/1.37   155.1.37.3

R7#

*** Where are my EXTERNAL BGP routes?  This is the PE! All of those label vs prefixes are from my internal OSPF core***

My question: 

Should I expect to see the eBGP routes and their associated labels anywhere on the PE?

I appreciate that the core is only bothered about getting the packet to the appropriate PE, however, I want to see that my dummy loopback routes are being tagged (which they obviously are).

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DHCP + Phone registration from HQ to CUCM help

January 12, 2015, 11:07 am
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I've been struggling with getting phones to autoregister to CUCM with CUCM scriber as DHCP server. Using INE racks.

Here is the scenario, and I'm hoping someone can see what I'm missing.

CUCM:

Auto registration assigned range 1100 - 1110.

CUCM Group se to have Subscriber as autoregistration server. Apply, reset, ok.

Verified all services running except Cisco Messaging Interface.

Reset DHCP monitor service.

 

DHCP server set to 11.100.64.12(subscriber)

DHCP subnet settings:

Sever(11.100.64.12)

SubnetIPV4: 11.102.64.0

Primary Start IP: 11.102.64.40

Primary End IP: 11.102.64.50

Primary Router IP: 11.102.64.254

IPV4 Subnet Mask: 255.255.255.0

Primary TFTP(150): 11.100.64.12

Seconday TFTP(150): 11.100.64.11

 

On R1:

Interface GIG0/0.102

 encapsulation dot1Q 102

 ip address 11.102.64.254 255.255.255.0

 ip helper-address 11.100.64.12

 ip tcp adjust-mss 1400

 ip pim dense mode

 

 

On Switch 1:

Fa0/12

 switchport access vlan 202

 switchport voice vlan 102

 spanning tree portfast

 

Vlan 102

 name HQ-Phones

 

Vlan 202

 name HQ-Data

 

I can't paste my debugs from the racks, but I can see using debug ip dhcp packet and debug ip dhcp events that the request is setting the giaddr to 11.102.64.254.

I am able to ping the subsriber 11.100.64.12 from interface g0/0.102 and from the hq-switch. Just not sure what I'm missing/overlooking. Any help appreciated.

 

 

 

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Routing Design Help?

February 16, 2015, 11:25 am
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Hi, please can you help me with a routing design issue. I am adding ISP 3 into the network in the link below. Note: All ISPs are advertising a BGP default route towards the WAN routers.

The requirements are that routing from subnet 1 use ISP1 for the gateway & ISP2 in a failure (this bit is fine). However, for Subnet2, ISP3 needs to be the gateway, and & ISP2 take over in a failure. The real issue here is making R2 use the default route via ISP3 based on the source of subnet2, which I feel can only be done based on policy routing (and I don't like that idea). There is also another issue here, where the FW needs to default route based on source-route but this is pretty easy on a Fortigate FW, so don't worry about that.

http://gyazo.com/f63ab65113d825ee007d3f13cd3dedff

The reason this design sucks is because the company is willing to buy nother WAN router to install ISP3. If they did, this design would be easy. But now on R2, traffic from Subnet 2 must go via ISP3, making the implementation more difficult.

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capability transit with OSPFv3

February 17, 2015, 4:38 am
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Hi all;

 

I wonder if OSPFv3 supports capability transit or something with the same results. 

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Typo in restriction in ticket 2?

February 10, 2015, 10:19 am
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Hello,

I'm just looking through the tasks in the full scale troubleshooting lab 3 and in ticket 2 it states:

 

Restrictions:

*Do modify the priority of any protocol to a value lower than the default.

 

Should that be "Do NOT modify" or is it really the intention to modify the priority?  Seems weird to word a 'Do' as a restriction? 

 

Thanks

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EIGRP Poisoned Floating Summarization

January 26, 2015, 3:45 pm
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Am I right in thinking that in IOS 15.X, a poisoned summary route will NOT make it to the routing table and will NOT be advertise? Where in IOS 12.X, the summary route does not get placed in the routing table but still gets advertised? If my understanding is correct, I'm not sure I understand the purpose for creating a poisoned summary route in this lab. If the summary route is not in the routing table nor advertise, why bring them into EIGRP using the network command in the first place?

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Is the physical topology supposed to look like this for R&S?

January 29, 2015, 10:43 pm
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Hi guys,

 

I need some help, it might sound like a dump question but seriously I'm a bit confused.

 

I'm trying to build CCIE Lab with GNS3, finally I got IOU to work. I'm just confused if the topology supposed to look like the attached picture? If so, will it work for all Labs or I have to keep changing it? 

 

Please help :) 

 

 

Thank you in advance,

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DHCP Information Option

February 17, 2015, 10:37 am
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hi all

this command I get it from INE WB

interface FastEthernet0/0

 ip dhcp relay information option subscriber-id VLAN58

 

could you please tell me what it means !?

I do understand DHCP Information Option 82, specificly the above command not

 

 

thanks,

 

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Wide Metric

February 17, 2015, 12:34 pm
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In classic EIGRP the BW was actually:

  • Bandwidth = Inverse lowest bandwidth along a path in Kbps x 10^7 * 256.
What this meant was that it was """"1/lowest_BW x10^7*256"""". I've been happy with this for years. Now for wide metrics, it's not really clear in the INE video if the bandwidth is still inverted. It just says the new bandwidth  is now called throughput, and is:
10^7 * 65536 / interface_bandwidth.
In the Cisco documentation it just says:
Minimum Throughput = (107* 65536)/Bw), where 65536 is the wide-scale constant. But it doesn't state what the BW actually is referring to???? is it 1/lowest bandwidth to the destination, or is it interface bandwidth, or is it 1/interface_bw? 
So can someone shed some light on this?
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Where can I find the mapping of the the different port channel algorithm

February 17, 2015, 8:42 pm
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Where can I find the mapping of the the different port channel algorithm. For example what Sid/did/oxid is on nexus command line and Sid/did on the command line. Thank you

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CCIE RSv5 Equipment Build

April 17, 2014, 12:57 pm
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Edit: This thread is getting too long, and it is now closed.  Please post in a more detailed thread below instead:

 

 

 

Use this thread for Q&A on how to build INE's new CCIE RSv5 topology, either in physical hardware or virtualization.  This thread will later be compiled into the new "How To Build A CCIE Rack" page.

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PFRv3 and split tunnel

February 1, 2015, 9:58 am
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I have a scenario where primary link is on MPLS and secondary on internet (IPSEC). The two links terminate on two different routers.

I plan to implement PFRv3 as part of Cisco iWAN. 

I have few questions and appreciate an opinion from the community.

 

1. I plan to use DMVPN with mGRE on both MPLS and internet connection. The requirement also is to break out the internet locally at the site. That is default route directly to internet instead of tunnel interface. In case of internet failure the internet should be accessible over the MPLS DMVPN tunnel. The two links should load share and do policy routing based on the PFR policies. Is it currently possible?

 

2. There will be spoke to spoke conversation as well. Does PFRv3 with EIGRP support performance routing between spoke and spoke.

 

Thank you.

 

Thank you.

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how to read multiple debug commands !?

February 17, 2015, 11:18 am
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hi all

 

I see videos and Labs where cisco engineer insert multiple debug commands and try to figure out the results !

 

I would like to know how multiple debug commands works !? will they work in order !?

 

like

debug ip dhcp server packetdebug ip dhcp server eventdebug ip dhcp server class
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What happens if MAC table aging is less than forwarding delay???

February 18, 2015, 1:27 pm
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Hi,

What happens with CAM aging timer during an STP topology change if it is configured with a value smaller than the forwarding delay (minimum is 10 link).

  • Is it increased to Forward Delay (def. 15)?
  • It remains at the configured time?

 

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show ip eigrp topology vs all links

February 18, 2015, 11:36 am
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In video 31 for eigrp traffic engineering, Brian does a #sh ip eigrp topology 150.1.6.6/32 command at 9mins in. There were 3 possible routes, however the 3rd route had a reported distance that was equal to the current feasible distance to the destination. I don't understand why this 3rd route made it to the topology table WITHOUT the keyword "all-links" in the show output. My understanding was that the show ip eigrp topology would show sucessors and feasible successors, but in Brians output the 3rd route was not feaisble, yet it was in the topology table.

The only thing I can think of for why it appears in the output is because a specific route was used in the show command, rather than just doing a generic #show ip eigrp topology. But I want to check with you guys.

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v5.ts1.task 6

February 18, 2015, 7:55 am
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Hi Guys,

 

 

This task has 6 errors to fix and it depends on task 5.  I spent 30 minutes on it before deciding  to move to the next.   I found only 3 errors. Is this the normal level of difficulty for troubleshooting?

 

 

Paulo

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Building INE's RSv5 topology with a Linux bridge and physical switches

February 18, 2015, 5:29 pm
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I have been playing with this for the last couple of days and I think this is going to work. Since I am going to be a little bit busy (extended work hours) for the next couple of weeks I decided to prematurely share this with you maybe together we can iron this out and see if it is really feasable or not.

I have not tested it extensively but at least the basic INE config comes up. Here is what I believe this configuration should look like:

Full size picture here: http://i.imgur.com/QQB7fZi.png

 

Something that I plan to test when I get my hands on a dump hub or switch

 

full size picture here: http://i.imgur.com/CSfCSWT.png

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STP topology change. MAC table aging timer change for how long?

February 18, 2015, 1:16 pm
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Hi,

Having a look at CCIE spanning-tree training videos....

The MAC aging timer says how long an inactive mac address stays on the MAC address (MA) table.
A topology change reduces this aging timer to Forwarding Delay timer (assuming its bigger than the Forwarding Delay).

Question:
For how long does this aging timer reduction last? How long until the aging timer gets back to the previous value? (300s assuming default)

2nd little question:
Does the topology change aging timer show up in output of "show mac address-table aging-time"? Any command to see if the reducing aging timer is  "in effect" at the moment?

---
Mario

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Finally purchased the AAP

February 11, 2015, 12:56 am
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After several years of being in this forum and just buying a workbook here and there, I finally got the All Access Pass last month.  I'm very happy with the product.

 

Ken

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Lab 1 Task 4.4

November 24, 2013, 6:08 am
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Hey,

Just completed Lab 1 for the first time, which went just fine, but I was puzzled during task 4.4. The "Labs Do's and Don'ts" specifies that use of additional IP addresses are not allowed unless specified (and that one should use IP unnumbered if needed). However, since task 4.4 does require new IP addresses to be completed, I'd suggest that it is specified in the task that use of (two) additional IP addresses are permitted.

/Mark

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