Example 966 Community List Examples

Ip community-list 1 permit no-export ip community-list 100 permit A645 ip community-list standard my-community permit local_as ip community-list expanded your-community permit 645 The first community list matches any RIB table entry with the NO_EXPORT COMMUNITY attribute. second community list, list 100, matches any RIB entry with a COMMUNITY attribute beginning wit string 645. The third community list, list my-community, matches any RIB entry with the LOCAL-A COMMUNITY attribute. And the last...

IEEE 8021d Spanning Tree Protocol STP

As Ethernet was evolving from a single shared cable to networks with multiple bridges and hubs, a loop detection and prevention protocol was needed. The 802.1d protocol, developed by Radia Perlman, provided this loop protection. As a matter of fact, it did such a good job at this that when most netwooks went from bridged networks to switched networks, the importance of spanning tree was almost forgotten. STP did an excellent job of preventing loops from occurring on redundanf switched networks....

CCIE Multicast Lab Scenario

When studying multicast for the TTIE lab, think about the wording of things. This chapter provided a number of examples from which you can understand the importance of isolating the key words. You must ascertain exactly how the TTIE lab wants you to perform the work. When comparing the multicast routing table with the unicast routing table, you might encounter gotchas, as outlined previously in the Multicast Troubleshooting Example section. You might encounter other en foreseen difficulties....

Figure 35 Overlap of Multicast MAC Addresses

224.1.1.1 224,129.1.1 225.1.1,1 225,129.1,1 238.1,1.1 238.129.1.1 239.1,1.1 239.129.1.1 An Ethernet multicast MAC address has some overlap the same MAC address is assigned to 32 different multicast groups. If one user on an Ethernet segment subscribes to multicast group 225.1.1.1, and a nother user subscribe s to 225 .w29. 1.1, both users receive b ooh multicast streams. I n en gineering multicast networks on LAN segments, this overlap needs to be specifically watched for and engineered to...