routers using auto summary with classless protocols (ie eigrp) don't generate a black hole, even when they have discontiguous IP networks. Instead, they summarize the two discontiguous networks, advertise a much larger route to the rest of the network, but retain the smaller, more granular routes of the discontiguous networks. Am I right so far?
When do black holes actually occur? When using RIP?
Black holes usually appeared when routes are not sychnorize in iBGP. For example. three routers in a network. Router A peer eBGP with ISP A and Router B peer eBGP with ISP B. Router C is a transit router that interconnect both Router A and Router B. There is no direct connection from Router A to Router B. The IGP in Router A, B and C is OSPF. When Router A learns a prefer route via BGP that is to be send via Router B, the packet will be forwarded to Router C. Router C without running BGP does not contain the routes and hence drop. This is a typically of black hole in BGP.
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...