Point-to-multipoint split horizon question

orange81orange81 Registered Users Posts: 15 ■■■□□□□□□□
in CCNP
Best practice says to disable split horizon on point-to-multipoint frame-relay connections. I understand that this helps routers learn routes from other routers on the NBMA link but then doesn't this cause routing loop issues?
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  • siggnationsiggnation Member Posts: 182
    It could. Another popular method is to create sub-interfaces to each branch site from the hub to effectively create point-to-point links on each.
    Currently Reading:

    CCIE Routing and Switching Written Exam v. 5.1
    CCIE Routing and Switching 5.0 OCG, Vol. I
    Cisco Lan Switching
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  • fredrikjjfredrikjj Member Posts: 879
    Not with EIGRP because split horizon in that case is only to reduce the number of routing updates. Other protocol features will prevent loops.
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  • wedge1988wedge1988 Member Posts: 434 ■■■□□□□□□□
    Also worth thinking about Prefix Lists and VRF. Although unconventional, nothing stopping you using these.
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