> From: Mark Tinka > Sent: Friday, June 21, 2019 9:07 AM > > > > On 21/Jun/19 09:36, [email protected] wrote: > > > And indeed there are cases where we connect customers directly on to > > the PEs, but then it's somehow ok for a line-card to be part of just a > > single chassis (or a PE). > > We'd typically do this for very high-speed ports (100Gbps), as it's cheaper to > aggregate 10Gbps-and-slower via an Ethernet switch trunking to a router line > card. > > > > Now let's take a step even further what if the line-card is not inside the > chassis anymore -cause it's a fabric-extender or a satellite card. > > Why all of a sudden we'd be uncomfortable again to have it part of just a > single chassis (and there are tons of satellite/extender topologies to prove > that this is a real concern among operators). > > I never quite saw the use-case for satellite ports. To me, it felt like > vendors > trying to find ways to lock you into their revenue stream forever, as many of > these architectures do not play well with the other kids. I'd rather keep it > simple and have 802.1Q trunks between router line cards and affordable > Ethernet switches. > > We are currently switching our Layer 2 aggregation ports in the data centre > from Juniper to Arista, talking to a Juniper edge router. I'd have been in > real > trouble if I'd fallen for Juniper's satellite system, as they have a number of > shortfalls in the Layer 2 space, I feel. > I'd actually like to hear more on that if you don't mind.
> > > So to circle back to a standalone aggregation device -should we try and > complicate the design by creating this "fabric" (PEs "spine" and aggregation > devices "leaf") in an attempt to increase resiliency or shall we treat each > aggregation device as unitary indivisible part of a single PE as if it was a > card in > a chassis -cause if the economics worked It would be a card in a chassis? > > See my previous response to you. > You actually haven't answered the question I'm afraid :) So would you connect the Juniper now Arista aggregation switch to at least two PEs in the POP (or all PEs in the POP -"fabric-style") or would you consider 1:1 mapping between an aggregation switch and a PE please? adam
