Thanks Keith. This is a real professional-grade lesson right here. As the video started, I said "wow, there's a lot going on here!!" And then you start going over each link, step by step, and everything seemed crystal clear. And what I love is that you don't skip steps, and you sound enthusiastic about the material, so it's easy to follow. I learned a ton in this vid and it gave me a lot more confidence in frame-relay. Best believe I'll be checking out the other vids, thanks so much
Thanks Keith for all of your videos! I am in the Cisco Academy now and learning all this great stuff. I frequently watch your videos for clarification because I like your teaching style! Thank you!
Keith your enthusiastic approach to explain the Stuff is really very nice. I have seen so many facilitator for all the topic however what you explain bit by bit without skipping any step its really awesome... Keep this up..
I was going to make a frame relay troubleshooting video for my meetup group/blog, but there really is no point since your video is so awesome. It helped me solve a bunch of sticking points in my CCIE labbing. Now, I just point all my students to your video!!
Thanks for the question, and the feedback. If R1 goes down, it is "game over" for R4 and R5 to communicate with each other. R4 and R5's only connection through the WAN (frame relay cloud in this case) is a single PVC (permanent virtual connection) that terminates at R1. If R1 isn't running, they are out of luck. When everything is working, traffic from R4, that is destined for R5 is sent through the PVC to R1, and then R1 forwards that packet down the PVC to R5. Hope that helps, Keith
Great question Jesse. Out of band management, such as dial up terminal server, or internet connected terminal server. We could also use the phone, and chat with someone who is at the remote site and ask them to issue the commands and tell us what they see (least favorite option).
Keith, you're owesome! Great troubleshooting case, great video, great explanations! Don't even think about to give up to your learning tutorials! I see that this video was watched by 28.982 times. It's not encouraging, but here people who really appreciate what you're doing. Thanks again and greetings from Romania!
Hello Rahul- NBMA, (Non Broadcast Multi Access) is more of a condition, rather than a feature or benefit. If we have 3 sites, and only 2 PVCs, we won't have a full mesh of PVCs. If we use those 2 PVCs, and we also put all three sites connected to the same L3 WAN subnet, that is an NBMA. A broadcast from one device with a single PVC won't make it both other devices. There are solutions to overcome the NBMA topology, based on the protocols being used, like OSPF network type.
If there are multiple branch offices, and you are using private IP addressing (so there are plenty of IP addresses to choose from), and you want to avoid issues like split-horizon, DR control, the simple solution is to make each of your branch connections (to the central HQ/hub) as point to point connections. NBMA is when you try to put all the spokes on the same subnet, but the spokes don't have literal PVCs between each other (no full mesh). Broadcast Multiaccess is what Ethernet uses.
DLCI/PVCs are associated with the physical interface, by default. If you want a PVC on the router to be associated with a sub interface, and that interface is a multipoint (configured that way), a static map in that sub interface will cause the PVC to be associated with that sub interface. If the sub-interface is a point-to-point (configured that way) interface, we use the frame-relay interface-dlci command to associate the correct dlci. Deleted implies the switch isn't adv. the PVC.
There are multiple options for using frame relay. Point to point and multipoint to begin with. Inside of either of those, we can use physical interfaces or sub-interfaces. In the video, I was simply showing some options for the purpose of variety and troubleshooting the different types of connections. Thanks, Keith
Magnificent video i missed frame relay class last week with a silly class spring break mix up,,,,great video no wasted words every thing Keith said is on point! Thanks Keith.
Hi Great questions. At 29:30 I hit esc and didn't show the rest of the routing table (once it showed that the network of 5.5.5.0/24 was missing) so we could focus on split horizon. The others would be: 23.1.2.146/32 23.1.2.128/29 23.1.2.140/30 23.1.2.136/30 at 31:36 It is showing some routes that didn't appear due to the esc at 29:30. 23.1.2.146/32 This host route represents R2's interface. R1 as a PPP peer adds this as a directly connected route, and EIGRP routing had the 23 net.
Thanks Keith for clearing that up... I have a follow up question regarding the host route 23.1.2.146/32 to R2s interface. Is the reason R3s interface, 23.1.2.150, is not added by R1 as a directly connected host route is because we are using HDLC and not PPP ? (from our earlier troubleshooting @ 5:22).. Again, I'm referencing R4s routing table @ 31:45... Thanks again Mr. Barker for all that you do, have a nice day :-)
This is an exceptional video for learning frame-relay configuration and troubleshooting. The many examples included should provide great opportunity for learning from beginner to advanced. Bryan McGann
Keith, you are definitely one of the more "infotaining" presenters on YT, keep up the good work :) Quick question: regarding the multipoint cloud, if R1 were to go down, would R4 and R5 still be able to communicate with each other? I'm assuming they could, via the mesh, but they wouldn't be able to talk to the rest of the routers R2, R6, etc, until R1 was up and running again. Thanks!
Thank you very much for spending your time and effort to create this very informational/professional video Keith... What tool are you using to draw the network diagrams?~ looks great!
Hej Keith thanks for a wonderfull video. I just have one question about the mappings that you are presenting on the video. Why is R5 not receiving dynamic mappings thanks to inverse ARP. Is it because it is a subinterface. Does this mean that to the subinterfaces the only to do frame-ralay mappings is to do static mappings? Best regards and congrats for a great video. Isaac
Greetings Mr. Barker, thank you for all that you do... I'm a little bit confused trying to understand the routing table on Router #4 @ 29:30... it shows the classful network " 23.0.0.0/8 is variably subnetted, 6 subnets, 3 masks " .. Why do we only see 2 out of the 5 subnets (6th being the 128 subnet)?? Then @ 31:36 after disabling split-horizon we compare before and after we see the other 3 subnets + the 7.0.0.0 network... Why do we see these now? What's the story with 23.1.2.146/32 @ 31:44 ?
Hi Keith, do you have a video about explaining the OSPF network types, NBMA full and star, Broadcast, Point-to-point, Point-to-multipoint Broadcast and Point-to-multipoint NBMA?
@Keith6783 Thanks, Keith. In addition to my request, Redistributing to EIGRP. Redistribution to OSPF is easy t under stand, but in EIGRP is kind of hard, especially on choosing the right value.
Keith, How would you perform this tshoot in a real life scenario? If your link was down would you get a remote hands tech and tell them the commands and have them read the response or is there some dial on demand appliance that you would use to gain a console to the remote device?
Mr. Baker, is it necessary to use the frame-relay map command on multipoint subinterfaces? Cant I just rely on IARP to do the mapping for me, given that I have included the frame-relay interface DLCI number command on both ends of the serial network? Also in production environments what is preferred, mapping through IARP or static mapping ?
Keith, Thanks very much. I am still unclear on p2p and multipoint, and when you use subinterfaces on FR. Why is R4 using s0/0 but r5 using a subnet of s0/0.1? Also, if you use a subnet, do you always use multipoint? When do you use p2p and multipoint? thanks.
Thank You Dr. Keith for the well explained videos. can you please assit us with COMPLEX WILD CARD MASKING ON CCNA. eg" complex wildcard mask is using the address 10.0.32.0 and wildcard mask 0.0.32.15 to select the first 15 host addresses in either the 10.0.0.0 network or the 10.0.32.0 network."i copied this from the cisco networking academy curriculum but couldnt understand how this is calculated. looking forward to seing your explanation. Thanks in advance Lamin . CCNA CANDIDATE JANUARY 2012
Thanks Keith for your videos it was very helpful, I have cleared my CCNA :). CSCO12696689, It took a long time for me to write the exam because I am into linux field... I had also watched your ospf lsa types... IPV6 ... NAT PAT and all those were very useful... :)
@Keith6783, sorry, i forgot to mention that I connected to the router using usb to serial converter plugged in to the rollover cable->which is connected to the router console port, but I am not sure which application (like hyper terminal in windows) to use and the required settings..I've installed the driver for serial converter...hope you understand my problem now..
@Keith6783 Thanks Keith...I recently bought a mac laptop, but I am new to Mac as i was using Windows OS till day...now, I don't know how to connect to the router console from my mac...I would really appreciate if you could help on this..thanks in advance..
hello Keith I'm having a serious issue which is similar to 18:58. the PVC that is active is assigned to s0/0 which should be s0/0.1 as multipoint and its causing the sub-interface to go down while the physical is up, the DLCI that has been assigned to s0/0 was not configured on the spoke (router) but was done on the FR switch. I think the FR switch is broacasting that DLCI to my phsyical int causing the map to be DELETED.(Please help!!!!!!!!)
