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jpv
New Member

Connectivity between 2911 and stack of 3750X

I have a 2911 connecting to the Net via one of its Gigabit ports.

Is there a way I can leverage the other two Gig ports to provide some redundancy for the connectivity back to the stack of 3750s?

--I thought etherchannel, but it does not look like the feature works with the onboard ports.

The 3750s have a Internet VLAN, which facilitates the connection to a pair of ASAs:

                                                    |--------- ASA--------|

Router ------  Stack (VLAN public)--- |                         | ---- Stack (VLAN transition)

                                                    |--------- ASA--------|

Thanks!

jpv

  • LAN Switching and Routing
2 REPLIES
Hall of Fame Super Blue

Re: Connectivity between 2911 and stack of 3750X

jpv wrote:

I have a 2911 connecting to the Net via one of its Gigabit ports.

Is there a way I can leverage the other two Gig ports to provide some redundancy for the connectivity back to the stack of 3750s?

--I thought etherchannel, but it does not look like the feature works with the onboard ports.

The 3750s have a Internet VLAN, which facilitates the connection to a pair of ASAs:

                                                    |--------- ASA--------|

Router ------  Stack (VLAN public)--- |                         | ---- Stack (VLAN transition)

                                                    |--------- ASA--------|

Thanks!

jpv

JPV

You could use IRB on the 2 interfaces on the router. That way you can have one IP address assigned to a BVI group and then the 2 gig interfaces are made part of the bridge group assigned to the BVI. One link would block but you only want redundancy as far as i can tell.

Edit - another alternative may be to run 2 routed links between the 2900 to the 3750 stack using private addressing. You then have an SVI for the public vlan on the 3750 and this is default-gateway for the ASA firewalls. Then run a routing protocol between the 3750 stack and the 2900 or use static routes.

Jon

jpv
New Member

Re: Connectivity between 2911 and stack of 3750X

You could use IRB on the 2 interfaces on the router. That way you can have one IP address assigned to a BVI group and then the 2 gig interfaces are made part of the bridge group assigned to the BVI. One link would block but you only want redundancy as far as i can tell.

Yes, just looking for an alternative path.

Will try IRB.  Thank you for the suggestion!

jpv

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