Re: Маленькая хитрость

AlexeyS писал(а):По всем счетчикам будет заметно, что одна карта нагружается больше.
Идея такая - следующая карта включается при превышении загрузки на первой, и отключается, когда траффик снижается
FEC у киски с современными версиями IOS устроен не совсем так, точнее - совсем не так

"The default is to use the source MAC address. This means that all packets the switch receives on a non-Fast EtherChannel port with the same MAC source address that are destined to MAC addresses on the other side of the channel will take the same link in the channel. Source-based forwarding should be used when many stations attached to the Catalyst 2900XL/3500XL are sending to a few stations (such as a single router) on the other side of the Fast EtherChannel. This is so that traffic is evenly distributed across all links in the channel. Also, the Catalyst 2900XL/3500XL switches maintain a notion of a "default" port on which to transmit traffic such as Spanning Tree Protocol, multicasts, and unknown unicasts. "
К примеру, Catalyst 5000 вообще определяет конкретный линк, по которому пойдут пакеты, простым XOR-ом младших битов у MAC-адресов источника и получателя:
"A connection across a Fast EtherChannel is determined by source/destination address pairs. An X-OR operation is performed on the last two bits of the source MAC address and the destination MAC address. This operation yields one of four results: (0 0), (0 1), (1 0), or (1 1). Each of these values points to a link in the Fast EtherChannel bundle. In the case of a two-port Fast EtherChannel, only a single bit is used in the X-OR operation. This scenario yields two possible results, each pointing to a link in the bundle. Circumstances can occur where one address in the source/destination pair is a constant. For example, the destination might be a server or, even more likely, a router. In that case, you will still see statistical load balancing, because the source address is always different."