I've got a faulty Cat 5K supervisor 1 blade and was going to have a go at fixing it.
Does anyone know what "LTL0, LTL1, or LTL2 Error" during startup actually means ? All I can find is "LTLn Error is a local target logic error" but this doesn't help very much in narrowing down the fault !
Each line card has a local bus arbitrar, there is also a central arbitrar on the Supervisor module. Once the line card is granted access to the backplane (the switching bus), the packet is transmitted onto the switching bus where all cards in the system copy it. Line cards also tag the VLAN ID on the packet before sending it on the switching bus, so other components know which vlan did that packet come from.
The EARL (Encoded Address Recognition Logic), which resides on the supervisor card, inspects the destination address, source address and vlan id of the packet. The MAC address and vlan id are put through a HASH function, which results in a 15 bit address which gets inspected against the EARL tables.
As a result of a "hit" (if entry is found), information is sent via the result bus onto the LTL (local Target Logic) which selects which ports are to forward that packet. That information is then sent to the LTL of each line card in the system. Line cards that are supposed to forward that frame will send it out of the appropriate port. Other line cards will just drop that frame.
In case of a broadcast, or a "miss" in the EARL search, the MAC address along with the vlan id are sent on the result bus to flood on that vlan only. Special frame types like CDP and SPT are treated differently.
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
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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...