Network types also differentiate themselves in the maximum distance they allow between adapters, and in the maximum number of adapters allowed on a physical network.
•Ethernet supports 10 and 100 Mbps currently, and supports hardware address swapping. Alternate hardware addresses should be in the form xxxxxxxxxxyy, where xxxxxxxxxx is replaced with the first five pairs of digits of the original burned-in MAC address and yy can be chosen freely. There is a limit of 29 adapters on one physical network, unless a network repeater is used.
•Token-Ringsupports 4 or 16 Mbps, but 4 Mbps is very rarely used now. It also supports hardware address swapping, but here the convention is to use 42 as the first two characters of the alternate address, since this indicates that it is a locally set address.
•FDDI is a 100 Mbps optical LAN interface, that supports hardware address takeover as well. For FDDI adapters you should leave the last six digits of the burned-in address as they are, and use a 4, 5, 6, or 7 as the first digit of the rest. FDDI can connect as many as 500 stations with a maximum link-to-link distance of two kilometers and a total LAN circumference of 100 kilometers.
•ATM is a point-to-point connection network. It currently supports the OC3 and the OC12 standard, which is 155 Mbps or 625 Mbps. You cannot use hardware address swapping with ATM. ATM doesn’t support broadcasts, so it must be configured as a private network to HACMP. However, if you are using LAN Emulation on an existing ATM network, you can use the emulated ethernet or Token-Ring interfaces just as if they were real ones, except that you cannot use hardware address swapping.
•FCS is a fiber channel network, currently available as two adapters for either MCA or PCI technology. The Fibre Channel Adapter /1063-MCA, runs up to 1063 Mb/second, and the Gigabit Fibre Channel Adapter for PCI Bus (#6227), announced on October 5th 1998, will run with 100 MBps. Both of them support TCP/IP, but not hardware address swapping.
•SLIP runs at up to 38400 bps. Since it is a point-to-point connection and very slow, it is rarely used as an HACMP network. An HACMP cluster is much more likely to use the serial port as a non-TCP/IP connection. See below for details.
•SOCC is a fast optical connection, again point-to-point. This is an optical line with a serial protocol running on it. However, the SOCC Adapter (Feature 2860) has been withdrawn from marketing for some years now. Some models, like 7013 5xx, offer SOCC as an option onboard, but these are rarely used today.
Cluster Planning 13
