RAD Data comm operation manual Switch Operation Modes, IPmux-11 with Two Ethernet User Port

Installation and Operation Manual					Chapter 1 Introduction
		Ethernet
		User Port 1
				Ethernet
			Internal
				Network Port
		Ethernet	Switch
		User Port 2
			TDMoIP
	E1 or T1 Port

Figure 1-11. IPmux-11 with Two Ethernet User Port

Note Priority is always given to TDMoIP packets inside the internal switch.

Switch Operation Modes

IPmux-11 offers two user LAN ports in addition to the LAN port on the network side. The device performs switching at Layer 2. The switch supports both transparent bridging and VLAN-aware bridging. The switch supports rate limiting of traffic going from the user ports to the network port. It supports up to 1024 MAC addresses (depending on their values and the order in which they are learned).

The switch modes are described later in this section. They are:

•Transparent

•Untagged

•Tagged

•Double tagged.

Rate Limiter Option

In this option a rate limiter is available to limit user port traffic. This feature is valuable when a limited bandwidth is used to extend the Ethernet link (generally when the Ethernet link rate is limited/shaped to a lower rate after IPmux). In this case TDMoIP packets will be dropped by a lower-rate device even if it was prioritized at the IPmux internal switch. This is prevented by limiting the user port to actual link rate minus TDMoIP bandwidth.

Network and user traffic can be limited to the following data rates:

•Network interface (egress) – 256 kbps, 512 kbps, 1 Mbps, 2 Mbps, 4 Mbps, 5 Mbps, 8 Mbps, 10 Mbps, 16 Mbps, 20 Mbps, 25 Mbps, 40 Mbps, 50 Mbps, 80 Mbps

•User interface (ingress) – 256 kbps, 512 kbps, 1 Mbps, 2 Mbps, 4 Mbps, 8 Mbps, 16 Mbps, 32 Mbps, 64 Mbps

When the rate limiter is disabled, there is automatic per-port limiting of 64 Mbps on every port, for protection against broadcast, multicast, and flooding, which could otherwise saturate the channel. If the default VLAN priority is lowered, then this automatic limit is lowered accordingly, to maintain this protection. Setting the default VLAN priority changes the automatic rate limiting in the following manner:

IPmux-11 Ver. 2.00 Functional Description 1-17