Feb
22
In the world of network monitoring, SPAN and RSPAN are useful features that can be implemented on Cisco switches. These two features provide the ability to transparently monitor (by copying) select ingress traffic, while allowing the switch to continue to forward the original traffic as normal. Both SPAN and RSPAN require the selection of one-or-more SPAN Source ports (typically physical interfaces, but entire VLANs can also be selected) as well as one-or-more SPAN Destination ports (where... Read More
Feb
05
Within the scope of Metro Ethernet services, it is often beneficial to provide customers "point-to-point" VLAN service, where VLAN (multipoint service in essence) is effectively set up to emulate ethernet "pseudowire", by disabling MAC-address learning. The benefit comes from saving metro switches CAM tables address space, thus improving overall scalability (which is far from perfect with Ethernet). There is special command, mac address-table learning available on Cisco Metro swtiches (e.g. ME... Read More

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