CCIE and its experiments | Life after CCIE

 Today we will cover some confusing options of the BGP 1). Route Dampening is only working for eBGP routes. It will not trigger on iBGP route. This technique is applied when receiving updates from external peers only (EBGP). Applying this technique to IBGP learned routes or to advertisement to IBGP or EBGP peers after making a route selection can result in routing loops. 2).  Peer Group : Since IOS version 12 manual peer group configuration is no longer necessary to achieve this optimization. IOS is capable of recognizing neighbors with the same outbound policy. These are then grouped together automatically. This is a feature called Dynamic Update Peer Groups. You can check the Dynamic groups using the command "show IP bgp update-grou p" command.  Changing a policy in out direction to a neighbor will also change the update group in the backend.  3). Simplifying Route Reflector rule : Books say there are three rules. But as per my complete understanding of this...

 What is Slow peer detection? We have a group of routers with the same outgoing route-map (outbound policy), which means the router will place all neighbors in the same group because the router wants to save resources to perform the same task multiple times for example: sending route updates.  The router will select a "Leader Router or Neighbor" and perform update or other algorithm tasks and will also replicate to all other routers in the same group.  What if any of one router is too slow due to hardware or software issues? This slow router is called Slow Peer. Slow peers affect the BGP convergence of the entire update group. If one BGP peer is slow, it causes the entire update group to slow down. The result is that the other update group members will have slower convergence as well. For this reason, the issue should be resolved. You can identify the slow peer and move it out of the update group. In order to complete this task, you can change the outbound policy for...

  Kompella method, Pseudowire is signaling via BGP which is one of the methods (Juniper) Martina method , pseudowire is signaling via LDP which is a second method (Cisco). This is the default method on Cisco Boxes. It does not support Autodiscover.  When multihoming a VPLS site (potentially in different autonomous systems [ASs]), the PE routers connected to the same site can either be configured with the same VPLS edge (VE) device identifier or with different VE device identifiers. If you are using different VE device identifiers, you must run the Spanning Tree Protocol (STP) on the CE device, and possibly on the PE routers, to construct a loop-free VPLS topology. Two VPLS NLRIs are considered equivalent from a path selection perspective if the following are the same: Route distinguisher VE device identifier VE block offset (the default VE range of 10 is applied) If two PE routers are assigned the same VE device identifier in a given VPLS, they must also advertise the same ...

 Today's topic is BGP: 1).  For Incoming traffic from the other AS to Local AS, BGP MED , AS-PATH Prepending , and Community Attributes can be used.  2.  BMP (BGP Monitoring Protocol) is an automated way of collecting BGP data from routers.  3).  BMP offers following Advantages as: Configure devices to function as BMP servers, and set up parameters on the servers, that are required for monitoring of the BGP neighbors. Establish connectivity of the BMP servers with BGP neighbors for monitoring. Generate statistics report from monitoring the BGP neighbors. Perform appropriate error handling on the BGP neighbors. Graceful scale up and degradation to the point of closing connectivity between the BMP servers and BGP neighbors. Read More about BMP :    

 A unique line posts are for your learning and notes. Will write down this type of post every day.  You can copy and paste it into your notes.  1). If you don't have Router Reflector in the MPLS networking and use full mesh connectivity, then you don't require Different RDs for installing two or more routes in the routing table.  2). Route Target (RT) is an extended community attribute used to import and exports VPN prefixes to and from VRFs.  

This is my first blog here. I hope to continue this blog eventually. I decided to write blogs here only. Previously, I tried several places, like on my website, WordPress, etc. I came back to Blogspot after a long time. Without further delay, let me jump to the subject. Recently, I received an interesting topic from my colleagues. He explained to me that he can't find the loop on the extreme switches. All switches show loop disturbances. Even two or three switches are not accessible. After solving this problem, I have decided to carry out a LAB on this topic. My main focus will be some questions 1. Why are all the switches showing loops, but the loop was only available on one switch? 2. What action should be taken to avoid such complete downtime if the loop is detected again? Designed a LAB with the following information: Let's change some configurations on the switches. I am using the default VLAN for this lab purpose. As MST is enabled by default on the default VLAN. I will d...