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jenkij1960

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1 Message

Wednesday, July 29th, 2015 3:00 AM

Network down but interface up/up

Question:

 

Using Comcast Business to to run IPsec tunnel back into network thru Cisco 1921 router. When Comcast network is down (cannot ping gateway address) interface on router stays in up/up state negating failover to back up wireless modem. Not sure why  interface on router is staying up when Comcast network is actually down...any suggestion would be appreciated.

 

 

Question

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Updated 

9 years ago

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train_wreck

Gold Problem solver

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610 Messages

9 years ago

Likely because as far as the 1921 is concerned, the PHY link to the Comcast gateway is still connected even when there are issues further on in Comcast's network. You will need to use another failover method than just detectong whether the Ciscos interface is up or down.

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skymeat

New problem solver

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39 Messages

9 years ago

Train wreck is on it here. The layer 2 link is up. Use hsrp to detect a down situation if you have dual cisco solutions. Also if you use a cradlepoint it's super easy, I would completely recommend.

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skymeat

New problem solver

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39 Messages

9 years ago

Also you will need to use object tracking with hsrp. Here's a good primer: https://mellowd.co.uk/ccie/?p=827

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