Recently I have encountered a problem while trying to implement NSSA area on a part of our network.
After redistributing static routes and connected with "subnets" keywords, the routers (ASR) were not able to see the static route with mask /24 in their routing table as N2 rouyte type, hence the external routes were not reachable by the routers sitting in the backbone.
The rest of the routes - connected and more specific subnets i.e. /25 were ok, only /24 caused the problems.
We have found two solutions to this problem:
1. We break the /24 in two /25 static pointing to the clients subnets reachable via these static routes
2. As we were using SVIs on the switches (6500) we have trunked the vlans (SVIs) outside NSSA area and re-terminated SVI with IP addresses on the device in the Backbone 0so end-to-end connectivity was passing over Layer 2 link and bypassing OSPF NSSA (of course as we were redistributing connected - SVIs too in this case - we were seeing them in the backbone).
Is there any specific reason why NSSA does not redistribute /24 static subnets outside to backbone 0 ?
Could it be a software bug ? If so, why /25 does work ?
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...