I think the best solution will be to add another router and terminate 2nd wan on it. and leave ur 4500 switch between and connect these two router's lan, create hsrp here and change ur user defaul gateway pointing toward this hsrp address.
leave ur default g/w for users as is, and add static route on 4500 wan link with higher admin distance,so if ur wan link fail with 3640 ,it will bring 4500 wan link as primary from backup.
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...