How does the Label switching takes place on the routers ( MPLS-IGP-Network) where route summarization is configured? If it learns many small subnetworks from some interfaces and a summarised route is published in order to reduce size of the routing table. How does the summarized route propagated in MPLS-IGP network? How does lables are handled?
Before we start, route-summarization is not recommended in the LSP path.
Assume, the LSP path is between PE1-PE2. If the route-summarization is done at the P4 means, P4 advertises the summarized route to P3 & to its upstream neighbors. However, PE2 advertises non-summarized route to P4.
In this case, P3 will see the route originated from the P4 (as summarised) and will do the Penultimate Hop Popping and deliver the Packet to P4 with VPN label only.
Since the P4 will have no knowledge on the Packets with VPN label, it will just ignore it.
In a normal scenario, the P4 has to do the Penultimate Hop Popping & deliver the packet to PE2. So, it is not recommended to go for route-summarization.
Some of you may have watched the session at Cisco’s first all-digital Cisco Live and I hope you found it helpful. This is the first in a series of companion blogs that will later cover in more detail the topics discussed in the session today. ...
CCO documentation lists out the ability to do a password recovery for eXR with a ZTP/PXE boot.
One can also perform the operation manually, like a "turboboot" for classic XR in this facinity.
this procedure will wipe out the complete system and install a...
Below is a link to a video showing how to analyze traceroute output in L3VPN and look up CEF forwarding and MPLS/TE/SR/SR-TE forwarding for labels through a domain. Some basic examples of traffic engineering are used but the concepts lend the...
This document summarises various health checks that can be done on a Cisco VIM pod.
Cloud sanity checks the health status of network, storage and various openstack infrastructure components like mariadb, rabbitmq etc....
The following pre-requisites are necessary for the migration from RSP440 to RSP880-LT to be successful.
Make sure that you have console access to the router.
Verify that the system is running a minimum o...