03-13-2008 09:47 PM - edited 03-03-2019 09:07 PM
hello,
We have two cisco 4500 series switches in connected in HSRP mode with multiple trunk ports. The STP is PVST.
Currently the ISP has provided a single internet link from their switch -1 its now connected to our 4500 switch-1.
For redunt purpose in ISP end, the ISP has added switch-2 and given the Link-2 for us.
if i connect to Link-2 in 4500 switch-2 in my end it may form a loop. How to avoid any loop as the ISP end configurations is not in my control.
thanks
prabu
03-15-2008 02:11 AM
you can use mstp and use the both links or simply run mstp.
regards
shivlu
03-15-2008 09:19 AM
How the ISP is handing down this connection?
Do they provide an IP address for your end device or is strictly Layer2?
If they provide an IP address, you can eliminate any looping or blocking ports by treating the 4500 as a true router.
You can run the switchport on both 4500s in routed mode instead of switchport/layer2 mode.
Routed Mode:
interface fx/x
no switchport
ip address x.x.x.x y.y.y.y
Layer2 Mode:
interface fx/x
switchport
switchport mode access
switchport access vlan x
interface vlan x
ip address x.x.x.x y.y.y.y
HTH,
__
Edison.
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