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Found 9 results

  1. What is the most useful BGP Path attributes? Which one of these attributes you use more? http://ipcisco.com/bgp-path-attributes-weight/ http://ipcisco.com/bgp-path-attributes-local-preference/ http://ipcisco.com/bgp-path-attributes-as-path/ http://ipcisco.com/bgp-path-attributes-origin/ http://ipcisco.com/bgp-path-attributes-med/
  2. Hi There, I'm doing a practice CCIE lab and I'm still struggling a little with the BGP best path selection process. Can anyone tell me what path attribute causes the best route to be selected from the following output? Please note that the router with BGP router-id of 150.11.2.2 is a an IBGP peer. The other two are eBGP peers. Also, why does the route with a next hop of 54.11.7.254 have an empty metric attribute and how is this compared to the metrics of zero? Rack11R6#show ip bgp BGP table version is 11, local router ID is 150.11.6.6 Status codes: s suppressed, d damped, h history, * valid, > best, i - internal, r RIB-failure, S Stale Origin codes: i - IGP, e - EGP, ? - incomplete Network Next Hop Metric LocPrf Weight Path * i28.119.16.0/24 204.12.11.254 0 100 0 54 i * 204.12.11.254 0 0 54 i *> 54.11.7.254 0 54 i Rack11R6#show ip bgp 28.119.16.0/24 BGP routing table entry for 28.119.16.0/24, version 2 Paths: (3 available, best #3, table Default-IP-Routing-Table) Advertised to update-groups: 1 2 54 204.12.11.254 from 204.12.11.2 (150.11.2.2) Origin IGP, metric 0, localpref 100, valid, internal 54 204.12.11.254 from 204.12.11.254 (31.3.0.1) Origin IGP, metric 0, localpref 100, valid, external 54 54.11.7.254 from 54.11.7.254 (212.18.3.1) Origin IGP, localpref 100, valid, external, best
  3. Introduction - I've been out of it for a while now, 1.5 years or so by now. So I'm starting fairly fresh. I started last night by setting up some gear - 19 4500/4700 Routers to be my MPLS/Service Provider Core and edge - also serves as a nice foundation for the troubleshooting section of the CCIE RS Labs. I've got a literal army of 1700/2500/2600/3640 Routers to service my Troubleshooting Sections - various configurations - this is another 60+ routers in total. I have to count them but I know I have 30+ 2600 XM/Non-XM's, almost 20 or so 1700's, and at least a dozen 3640's so that is literally enough for mostly anything. The location I'm using is power-full - over 400amps of power and ample cooling. The idea is to use 3 VoIP Routers for my Voice Lab, and then 3 more routers as the remaining routers for the primary CCIE RS Lab. L2 Routers - 2950's connect the RS Routers, Security, SP, VoIP, WLAN, SAN, and CCDP/E, racks of gear together - to the backbone itself. This may sound overly complex but hey... it just is. It's my skillsets and I've CCNP/CCDP level in all of the above skillsets and so I have my reasons - I'm also a practicing Enterprise-Level Network Architect/Engineer/Manager so... It works for me. I have a slew of Firewalls, IPS/IDS, Load Balances, WLAN Gear, Authentication, Network Management/Analysis, Domain and Workstations of various types to do as I please for my little network. I know its overkill and Mark will be the first to remind me. It's what's on my plate and this is how it is going to work. I cannot afford to constantly rebuild/re-design the lab so I'm doing it up front and in a scalable manner. I'll supply some pictures as I go and of course will answer any questions as best I can and if they are practical I can lab them up on this gear. I said some pictures - I meant a lot of pictures - this is meant to be a practical and very visual journey. I've purchased mostly every work book by now and I have access to every book there is in print - so I can work with mostly anyone on any problem as I go. My primary goal is experience and expertise and of course if I'm doing all this correctly a CCIE or two may come of it eventually. No rush for me. I already command a CCIE Plus's salary and benefits and am bombarded daily by so many offers it is nothing less than incredible - so I don't have the need to rush it or need a vendor to validate what I don't know yet. Anyone reading what I'm writing can make that distinction clearly enough. So I guess this is sort of my own little onlineportfolio of what my own capabilities are and are not. I do have to take the exam and I am due to re-take the CCIE RS Written again and it will renew several of my lower-level certifications at the same time. I have to admit that I get books and perform book reviews for Cisco Press so I may sideline publicly to demonstrate some labs or concepts I find interesting along the way. As of now: 1. I stacked some 4500/4700 routers. 2. I started reading the old Chesapeake class on BGP from the 1990's. After I complete my refresher reading, I'll take on the labs included in this course. OSPF is the next course from the same training course of the period and I'll be working on it next. Sounds old but I like them and they work for me. Anyone intersted is welcome to follow along. I'll probably use Visio and Adobe PDF's to illustrate the lab scenarios I am working on for a more visual representation of my work. Expect a lot of output from the Routers in each lab. Might be boring to some people. Maybe not to everyone. This is all just to warm up for more things to come.
  4. Hi Folks, I am trying to capture BGP control packets between two peers. As part of that I am configuring an Extended ACL with the following conditions : ip access-list ext BGP_ONLY permit tcp any any eq 179 permit tcp any eq 179 any Next I bind it to the embedded capture filter so that it filters only the BGP packets. What I notice is that it captures only uni-directional BGP packets. Can someone please help me understand whats it that I am doing wrong. I guess my ACL is not correct. Thanks in advance.
  5. BGP

    HI all: I'm studying for the CCNA, and I have some experience in networking, but in my work we are using BGP so I need to jump ahead and start understanding this "little" thing. Could you please recommend me some material to use? Thanks
  6. Hi all, just an hepl on a thing which is not quite clear fron Cisco documentation. Does Route Policies in IOS XR have the same "implicit deny all" as route-maps in IOS ? For instance, consider the following IOS XR Route Policy, to be applied to a BGP neighbor in the input direction: route-policy SET-LP if community matches-any (65000:150) then set local-preference 150 endif end-policy What happens to a BGP UPDATE that contains for instance a Community 65000:1 ? Is it dropped (as it would happen with rout-maps) ? Or is it accepted (as it would happen for instance with JUNOS-like routing policy) ? In case I need all the routes to be accepted do I need to change the Route Policy as follows ? route-policy SET-LP if community matches-any (65000:150) then set local-preference 150 endif else pass end-policy I thank in advance everybody who can help me.
  7. Dear friends, Kindly I request your assistance on this. Below screenshot shows routes received from my eEGP peer. But the same routes (10.248.0.0/16 and 10.248.0.0/15) are being advertised by my side to the same peer. Will my peer find them in his table? Appreciate quick reply, Thank you.
  8. Dear friends, Kindly I request your assistance on this. Below screenshot shows routes received from my eEGP peer. But the same routes (10.248.0.0/16 and 10.248.0.0/15) are being advertised by my side to the same peer. Will my peer find them in his table? I had simulated this in GNS3 but didnt see re-advertising the same routes. Appreciate quick reply, Thank you.
  9. BGP

    Hi Friends, I have a doubt on BGP I have a routers connected as shown below A------B------C where A & C are in same Autonoumous System, B is in different AS there is no direct connection between A & C how does A and C communicate Thank you