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  1. Senior Member
    Join Date
    Dec 2014

    Default Does Anyone Know WHat Att/p/OL stands for in ISIS?

    I am aware that OL that for overload but not the rest.
    A google search don't yield anything useful.
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  2. Member Neil86's Avatar
    Join Date
    Mar 2017
    Vancouver, WA

    A.S. - Network Infrastructure
    ATT—Attach bit. This bit indicates that the router is also a Level 2 router, and it can reach other areas. Level 1-only routers and Level 1-2 routers that have lost connection to other Level 2 routers use the Attach bit to find the closest Level 2 router. They point to a default route to the closest Level 2 router.
    P—P bit. Detects if the intermediate system is area partition repair capable. Cisco and other vendors do not support area partition repair.
    OL—Overload bit. Determines if the IS is congested. If the Overload bit is set, other routers do not use this system as a transit router when calculating routers. Only packets for destinations directly connected to the overloaded router are sent to this router.

    Last edited by Neil86; 02-25-2018 at 02:14 PM.
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