IGMP is used in multicasting. It's a protocol used by applications to send information on joining or leaving a multicast session. The new generation cisco switches can perform IGMP snooping, meaning that multicast requests are identified at switchport level and the switchport is added to a particular multicast group. The multicast packets are only sent to the group, meaning the multicast stream is only send to switchports/users which asked to join. This reduces network load, without IGMP snooping the multicast streams would be sent to every active port on the network. IGMP comes in different versions, Versions 2 and 3 bassicaly have more options in communicating about the multicast session.
IGMP works over both Lan and Wan, it's merely additional info in the IP header. The technologies on what to do with IGMP are numerous, differ from L3 and L2 and can be quite complex (IGMP Snooping, CGMP, PIM)
Question We run asr9001 with XR 6.1.3, and we have a very long delay to
login w/ SSH 1 or 2 to the device compare to IOS device. After
investigation, the there is 1s delay between the client KEXDH_INIT and
the server (XR) KEXDH_REPLY. After debug ssh serv...
Introduction The purpose of this document is to demonstrate the Open
Shortest Path First (OSPF) behavior when the V-bit (Virtual-link bit) is
present in a non-backbone area. The V-bit is signaled in Type-1 LSA only
if the router is the endpoint of one or ...
Hi, I am seeing quite a few issues with patch install and wanted to
share my experience and workaround to this. Login to admin via CLI, then
access root with the “shell” command Issue “df –h” and you’ll probably
see the following directory full or nearly ...