What function does this etherchannel have ?

[Eriknx]

Hello 
I just came across a Cisco config guide for HSRP and I was wondering what function does this etherchannel have.
1. Is it a switched port-channel or EIGRP ?
2.What does it contribute with to the network ? If DLS1 falils, his DLS2 will become default gateway fo his VLANS and it will have 1 a direct connection to Border1 and Border2. 

Also, would you be running iBGP on Border1,Border2, DLS1 and DLS2 ?

[Jon Marshall]

Agreed, if each access switch has unique vlans then you can use L3 interconnect as you say. 

Jon

[MHM Cisco World]

Why L2 if ACCESS SW have same VLAN ?
if the host in ACCESS SW1 want to send traffic to Host in ACCESS SW2 same VLAN 
the traffic not route it bridge and hence here we need L2. 
this make Host connect to other host in other SW through L2 bridge. 

but we can use it also to run EIGRP.

[MHM Cisco World]

@Jon Marshall @Eriknx 
""The above is fundamentally wrong.""
it not wrong, I was talking if ACCESS SW contain different LAN, 
when AGG-1 loss it connect to ACCESS SW it will not have any port assign to VLAN and hence the SVI is DOWN and AGG-1 use interconnect L3 to forward traffic to AGG-2 and AGG-2 will forward it to client since it have UP SVI.

So If it wrong can you explain how ?

[Jon Marshall]

It is not wrong if each access switch has unique vlans but the original diagram posted did not suggest that was the case. 

Also you are explaining things to me I have already explained in previous responses in this thread. 

I am not disagreeing with your point about unique vlans on each access switch and using a L3 interconnect, but as I have already said, the original diagram the OP posted did not show a L3 interconnect and I was answering that question. 

Jon

[Jon Marshall]

Just to add the only way it could work with a L3 interconnect the way you describe would be if vlan 20 was only on ALS2 and no other access layer switch so that if DS1 to ALS2 went down so does the SVI for vlan 20 on DS1 so now it can route the traffic for vlan 20 to DS2 across the L3 interconnect. 

But the fact that the uplinks from the access switches are trunk links suggests both vlans (10 and 20) are on both switches so the SVI would not go down. 

Jon

[Flavio Miranda]

Hi

What function does this etherchannel have ?

Aggregate throughput. Link redundancy

I just came across a Cisco config guide for HSRP and I was wondering what function does this etherchannel have.
1. Is it a switched port-channel or EIGRP ?

 Port-channel and EIGRP are two completelly differents protocol.   So, according to the picture, it is a Port-channel.

2.What does it contribute with to the network ?

Aggregate throughput. Link redundancy

If DLS1 falils, his DLS2 will become default gateway fo his VLANS and it will have 1 a direct connection to Border1 and Border2. 

Yes.  thanks to HSRP.

Also, would you be running iBGP on Border1,Border2, DLS1 and DLS2 ?

Could be.

[Joseph W. Doherty]

Etherchannel makes additional bandwidth available, vs. a single link.  It also adds redundancy, in different ways, for "critical" links.  It also, by creating one virtual link, can obtain multi-link usage, that STP would block at L2.  It also tends to fail-over and recover rapidly individual link.

Basically, all the forging is mostly independent of FHRPs, IGPs, etc.