The SINGLEstream™ Dual Link Aggregation Tap is designed to tap two full duplex Ethernet segments where total aggregate utilization of full duplex traffic on both segments does not exceed 1 Gig. The Dual Link Aggregation Tap is ideally deployed monitoring is required for two segments that are “channeled” together, such as Cisco Ether Channel or Nortel Multi Link Trunking.
It is also effective when used in active/passive failover link pair scenarios where two identical network segments are set up for redundancy. If the active link fails – e.g. a firewall connection - the traffic fails over to the passive link. The Dual Link Aggregation Tap provides uninterrupted visibility to a single monitoring tool that can view traffic on both links.
Finally, asymmetric routing paths (used by routers) and load balancing (used by servers) are implemented to maximize bandwidth and performance. The SINGLEstream™ Dual Link Aggregation Tap can aggregate all the data from asymmetrically routed and load-balanced traffic on two network segments and allow monitoring tools with single receive interfaces to view all the data copied from both links.
How do I connect to my SINGLEstream device through the serial port?
First, be sure that you are using a “DB9 M/F Straight-through Serial Cable” to connect to the device. If your PC does not have a serial port, you can use a “USB to DB9 Serial Plug-in” adapter in combination with the serial cable to connect to it.
Second, check to make sure that you are using a compatible terminal emulator. Tested and proven terminal emulators to work with Datacom Systems devices include Putty and Tera Term.
In order for the terminal emulator to successfully communicate with the SINGLEstream™ Aggregation Tap, the following terminal settings must be configured:
Serial Terminal Settings
- Bits per second: 9600
- Data bits: 8
- Parity: None
- Stop: 1
- Flow Control: None
- Font: Terminal or Proxy
What is that
The LINKprotect™ feature of Datacom Systems SS‐1200/2200 and 4200 series network taps provides a reliable system for ensuring that the endpoint devices of tapped links will properly engage routing protocols, redundant failover systems etc. in exactly the same manner as they would if the tap were not present. This feature only exists on link that tap copper media, since fiber taps are completely passive and will not drop a link.
The taps use a Gigabit chipset for tapping the data as well as aggregating and regenerating copies to the monitoring tools. When a tap is in active mode the data path of the tapped link is routed through the chipset.
If power is lost, or one tap port (of a two port tap group) loses link, then a set of copper relays automatically moves into closed position to provide a passive bypass.
The clicking sound is the relays moving from open to closed and back to open positions. By default all taps ship with Linkprotect on, with internval timers 1 and 2 set to 10 seconds. To eliminate the clicking sound, you can connect all tap ports to their end devices. This is the recommended and safest tapping method. You can also turn off the link protect feature.
Commands to turn on / off LinkProtect are as follows:
SET LINK PROTECT(SE LP) tap enable int1 int2 recovery
tap tap number
int1 fail interval 1-3600(secs)
int2 recover interval 1-3600(secs)
telnet into the device: default IP address: 192.168.1.1
enable mode: su
enable or superuser mode password: password
Example to turn off LinkProtect on tap group 1 (usually ports 1 and 2 on the far left)
se lp 1 off
Example to turn on LinkProtect on tap group 1 (usually ports 1 and 2 on the far left) with the fail closed timer (int1) set to 10 seconds, and the recovery timer (int2) set to 3600 seconds. This setup will throw the relays after 10 seconds if one side of the tapped link loses link status. It will check both ports every 60 minutes and reconnect the tapped ports if link exists on both of them. If no link is on both ports, the relays will close, and will retry after another 60 minutes. If link exists, the tap is automatically inserted inline and will remain that way. If you replace AUTO with MANUAL, the tap will stay out of the link until it is reconnected by cycling the "se lp" command.
se lp 1 on 10 3600 auto
MANUAL recover example
se lp 1 on 10 3600 MANUAL