Need an Input on Configuring LACP on the WAN interface of Edge Route

[DCCS-NWOps]

Currently we are having two routers cisco 8500 which is connecting to two different ISPs. Proposed scenario is to have a single ISP Link. where the Provider can able to configure LACP on their MUX and the same has to be done on the edge router R1 and R2 with LACP.

Is this a recommeded desing to implemenent kind of datacenter setup,

When LACP need to configured on both the routers , there is a need to have VRRP or HSRP on both the routers interface connecting to ISP mux. Since for having the single IP as virtual IP for VRRP interface on the routers .Also by configuring in these ways will have excess of IPs will be used on both the routers (minimum of /29 ) is required for configuring between mux to router.

Routing protocol used here in the routers are bgp for advertising the routes with ISP , in this case can the failover be happens with using the bgp prefernce or can be done using the VRRP.

[M02@rt37]

Hello @DCCS-NWOps,

BGP is already a dynamic routing protocol that's commonly used with ISPs. It can also handle failover between multiple links effectively by adjusting route preferences. If one link goes down, BGP can reroute traffic through the remaining link. However, the actual failover time with BGP might be a bit slower compared to using protocols like VRRP/HSRP, which operate at a lower layer and can respond more quickly.

Some organizations use a combination of both. VRRP/HSRP provides quick local failover for gateway redundancy, while BGP handles failover between different ISPs or links on a broader scale.

You're correct that using VRRP/HSRP would require a dedicated IP address for the virtual interface. This might require additional IP addresses from your address pool.

[MHM Cisco World]

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[DCCS-NWOps]

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[Giuseppe Larosa]

Hello @DCCS-NWOps ,

>> Proposed scenario is to have a single ISP Link. where the Provider can able to configure LACP on their MUX and the same has to be done on the edge router R1 and R2 with LACP.

This is not supported as LACP is designed to connect two systems on multiple links but you have two routers and one upstream router, you would need to terminate the LACP bundle on a L2  DMZ LAN switch. You can have three L2 port channels defined on the L2 LAN switch one for each router.

However, the L2 DMZ LAN switch and the ISP router would be single point of failure so from a redundancy point of view I would not recommend this design. You should connect your two routers to two different ISP routers in order to achieve true link and node fault tolerance.

For routing purposes as already noted you can use eBGP and you can take advantage of BGP attributes to build the desired routing strategy.

Hope to help

Giuseppe

[paul driver]

Hello
BGP multihoming would be applicable here using its best path attributes as a means to traffic engineer egress/ingress preferred routing paths, Plus it will also assist in making sure you do not become a transit path for either ISP.