Switching White Papers
Using the IS-IS Attach-Bit Control Feature
Overview In Intermediate System-to-Intermediate System (IS-IS) networks, routing inter-area traffic from Layer 1 areas is accomplished by sending the traffic to the nearest Layer 1/ Layer 2 router. A Layer 1/Layer 2 router identifies itself by setting an ATTach-bit (ATT-bit) in its Layer 1 Link-State Packet (LSP). In some situations, however, it might not be desirable to set the ATT-bit. For example, if there are multiple Layer 1/ Layer 2 routers within a Layer 1 area and one of the Layer 1/Layer 2 routers loses its backbone connection, continuing to send inter-area traffic to this Layer 1/Layer 2 router can cause the traffic to be dropped.
| Publisher | Cisco Systems | File Format | |
|---|---|---|---|
| Date Published | January 2002 | ||
| Format | White Papers | ||
| Topics | |||
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