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Beginner

Spanning Tree on Routers

I found show spanning-tree commands works on Cisco 7600 router.

My understanding is that spanning tree is needed on switches to avoid loops.

why do we need spanning tree on routers?. Please advise

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Engager

Routers capabilities differ.

Routers capabilities differ. Since Cisco had targeted 7600 as a carrier grade edge services router they didn't want to restrict on the services providers could provide, or users could use.

By introducing STP on 7600's they were able to offer ability to users to leverage 

  • Carrier Ethernet: Aggregation of consumer and business service
  • Ethernet services edge: Personalized IP services

not limited to the flexibility it gives to place such devices in topologies where you would have to use VLANs.

hope this helps

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