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Questions tagged [metro-ethernet]

For questions about Metro Ethernet, where a metropolitan-area Ethernet, Ethernet MAN, or metro Ethernet network is a metropolitan area network (MAN) that is based on Ethernet standards. For instance, you are troubleshooting throughput problems from your data center through your metro Ethernet to end users.

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Which Ethernet Ring Protection Switching (ERPS) feature makes it so faster than RSTP/MSTP?

I want to know what makes it possible for ERPS to converge under 50 ms? it's a hardware-specific feature that provides this fast convergence or it is about the much more efficient algorithm? I read ...
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32 views

Why do all leaf nodes in an E-Tree service belong in the same subnet?

I'm studying the CCNA R&S at the moment and I'm a bit confused about why E-Tree services require all leaf nodes to belong in the same subnet, despite the leaves only being able to send layer 2 ...
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214 views

Why Ethernet was chosen to be the primary protocol + why carrier ethernet was created?

I'm currently trying to investigate the extra benefit that Ethernet has to offer for the internet today. As far as i investigated & know, Ethernet gives us a new hardware, cables and functionality ...
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74 views

Carrier Ethernet

On my courses slide there is a chapter about this concept. I thought it was some sort of idea about replacing legacy and non-flexible technologies as SONET and so on in favor of Ethernet family ...
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204 views

Vlan translation and Swapping

Heey, all As an ISP provider, We are trying to connect Multiple customer sites via our Mpls core. our plan to give each customer site a different vlan ( c-vlan) and then translated to S-vlan to ...
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1answer
1k views

Frame tag decision based on switch port TPID (EtherType)

I'm working on developing the ingress logic of a software switch and have a doubt. So here's my understanding. When a frame ingresses a switch, its 13th and 14th byte are checked against standard 802....
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268 views

Metro Ethernet no layer 3 connectivity

We're working with a metro ethernet provider to bring up a new multi-point connection between our sites. Currently we're just trying to get it working with two sites. As a simple test I've plugged in ...
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0answers
372 views

Can I do an RFC2544 test with a JDSU SmartClass Ethernet and a C1921?

I need to do RFC2544 tests of about 70 links, in different locations, before July ends and I only have about 11 JDSUs, so for some of this tests I won't have 2 JDSU available where I need them. Is it ...
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708 views

SVI on ME-3600 Going Down No Apparent Reason

We have a ME-3600 we're seeing a strange issue with. The device has an SVI which is used within a full-mesh metro ethernet network. The SVI is used for management and is also the peering source for ...
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482 views

Carrier Ethernet, difference between ESP and EVC

Does anyone know the difference between an ESP (Ethernet switching path) and an EVC (Ethernet virtual connection)? Best regards, Michelot
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2answers
6k views

Troubleshooting low Metro Ethernet TCP throughput

The setup We have rented a few leased lines that present themselves as a layer 2 network, i.e. you have one big pipe at the datacenter and the remote sites have smaller pipes. Inside the layer 2 ...
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1answer
1k views

Unidirectional Packet Loss

Recently after upgrading several MetroE circuits (L2 connectivity) from 100Mbps to 1Gbps, I noticed that large file transfers fail between some sites; however, the transfer only fails in direction. ...
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791 views

What happens when you stop receiving BPDUs with no L1 loss?

We have a redundant path for some of our communications through a.) a Metro-E provider and b.) two routers forming an L2TPV3 tunnel. We have Cisco 2960 switches at both ends running RSTP to prevent ...
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277 views

IPSec/GRE over Metro-E traffic question

I am trying to run IPSec GRE over a MetroE circuit: ROUTER---------metroe----------ROUTER The routers are set up to route all traffic over the ipsec tunnel; however, when I check the routers I see ...
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901 views

VLAN load sharing on Metro-E links between two Juniper EX 4200

We have Juniper EX 4200 as core switch at two sites connected Cisco 2960s and Cisco 3560s (access layer switches). For even-numbered VLANs, one Juniper switch is root bridge and for odd-numbered ...
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959 views

carrier's vlan tags overlap my own

I have a 3 site network: one is a data center colo and the other two are offices. The new Metro Ethernet service we just installed requires the colo site's traffic destined to the offices to be in ...
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7answers
7k views

Does it make sense to deploy OSPF across Metro Ethernet?

When I need to connect a number of branch sites to one another for a customer, I typically recommend an MPLS VPN through a trusted carrier. The CE at each site speaks BGP with its upstream PE and each ...