Comcast Metro Ethernet Setup

We have one customer with one ASA and one 3750 switch in headquater. 6 1801 Routers in 6 branches.
All connected via MPLS/BGP provided by ATT. And it was terminated at one port on 3750.
We plan to replace that with Metro Ethernet Hub/Spoke topology since the customer mentioned each office never talks to each other. Later on we found they have IP phones do need to talk with each other at branches.
Question - can we still use the MetroE service but configure routing to make each office talk with each other and how that would work?? I would assume some routings on 3750.
Any info is appreciated. thanks!
Ben

Hi Ben,
It will work for sure since this is what ( in a much more complex scenario) we are implementing in our company since ab few months. Just take care of defining data and voice subnets as technically unrelated so to be free implementing very flexible and easy to manage routing policies. Is ATT providing L3VPN or what?
Hope to help
Alessio
Sent from Cisco Technical Support iPad App

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Metro Ethernet Design With Redundant Head Ends

We're getting ready to turn up some metro ethernet circuits that were just installed by AT&T. AT&T has provided a VLAN for each remote site (so each site has its own VLAN), and those VLANs are trunked to our head end switches (Cisco 3750 Metro Switches).
I'm struggling with the best design for IP routing. We currently use OSPF on our internal network, and I was going to extend OSPF to our metro solution as well, but I'm not so sure now.
I don't want routing to occur directly between head end #1 and head end #2, we already have redundant paths within our corporate network, and allowing our two head ends to route between each other via our metro ethernet solution is not what we want. However, running OSPF on each of the VLANs which have been provisioned for us would permit routing between the head ends.
We simply need to allow redundanny for our remote locations in the event that one head end were to fail, all of the traffic to/from the remote site would be routed through the head end which is still online.
Anyone suggestions on the best routing design for this situation would be greatly appreciated. I've attached a network diagram to make things clear. I believe I can also go back to AT&T and request one VLAN that includes all sites if that would simply things. I just need to make sure I can still do our traffic shaping because the remote sites are only 10mbps and the head ends are 1gbps.
Thanks,
-Steve

just at a glance it looks as if you should be able to have stp on and setup 1 site as primary and other as secondary

Traffic Shaping on 6880 between sites over metro ethernet

Hi
I have a new dual site setup with 6880s at the core at one side and 3650 stack at the other. We have a 200mbps ethernet solution from our service provider but on testing we are maxing at a bit over 100mbps, iperf tests directly on the link are giving 200mbps so I need to apply some shaping to get the full usage from the link. In the past I have used srr bandwidth on metro switches but the 6880s don't support this. So I assume I need to setup policy maps and apply to the physical interface? The interfaces are layer 2 trunks and we are stretching vlans between the sites. E.g. siteA has vlan20 and site B has vlan 20 over the metro ethernet service, site b is layer2 only and all routing and services are provided at siteA
Is it as simple as this? It seems too easy :) So I may be missing something. I just apply this on the physical interface at each side?
policy-map POLICY-S2S-200MB
class class-default
shape average 204800000
policy-map POLICY-S2S-200MB-IN
class class-default
police cir 204800000
conform-action transmit
exceed-action drop
~
int gi1/1/1
service-policy out POLICY-S2S-200MB-OUT out
service-policy out POLICY-S2S-200MB-IN in
Your input would due treaty appreciated!
Thanks,
Aidan.

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Ah, well that's great! (Hmm, now I wonder if same feature is available on 6500 with sup2T or 6807.)
In that case, your output policy might be just as simple as what's in your OP. Cisco isn't really clear whether all their shapers (or policers) are counting L2 and L3 or just L3. I suspect many just count L3. If that's true in this case, you may need to shape about 10 to 15% slower to allow for L2 overhead (this assuming your provider is providing 200 Mbps of "wire" bandwidth.
If you're able to shape on the other side, then there should be no need to also police the ingress. Also, assuming provider limits bandwidth, there's no reason to police ingress at CIR rate.

Bellsouth Metro Ethernet -- is it QinQ?

I have a customer who has bought some connections from Bellsouth's Metro Ethernet product. I am having a tough time getting someone at Bellsouth to give me any information about the product.
Are they just using QinQ (802.1q tunneling) to make it all happen? If that's the case then I should just trunk to them with 802.1q and not have to do anything else, I believe keeping the native vlan 1 should even be fine. If anyone knows anything about this or has connected sites using the Bellsouth metro-e product please let me know.
Brian

Hello,
looks like it is Ethernet over SONET, with a possibility to migrate it to EoMPLS:
"Currently BellSouth uses a specialty Ethernet switch to support its shared multipoint offering, but that may change. "We're converting to more of a general purpose device that will be part of our MPLS network and will deliver Ethernet and other services," hints Kaish.
Some carriers have implemented shared multipoint services directly over fiber, which means that those services do not include Sonet restoration capability, effectively limiting them to non-critical traffic. But BellSouth's metro Ethernet network is Sonet-based and customers can leverage Sonet's restoration capabilities, Kaish says."
http://www.findarticles.com/p/articles/mi_m0DUJ/is_13_107/ai_108408900
Another source of information supporting the statements above:
http://newsroom.cisco.com/dlls/2004/prod_070604.html
In any case this does not mean straight forward, that you can use the service to setup trunks between your switches. This depends on the interface configuration of (presumably) the 7600. They might restrict you to dot1Q with one VLAN or even to plain ethernet.
Hope this helps! Please rate all posts.
Regards, Martin
P.S.: have a look at http://www.metroethernetforum.org/presentations/SC2003_BobSmithEntNet.PDF which should answer many questions! Especially they state "Dedicated Ethernet supports VLAN tagging" - sounds like setting up a dot1Q trunk with them will be supported.

Suggest No. of routers in a single metro-ethernet Vlan

Hi,
Just would like to know if there is a recommended no. of routers to put into a single metro-ethernet vlan. The local Metro-ethernet provider suggest 10 routers per vlan but I think 30-50 would be OK ?

This question is like how many nodes can you put into a VLAN. For an answer to be given your traffic types would need to be known. How chatty are your routers? Are you bridging? What type routing / bridging traffic (non-unicase) might you have on the wire? Baseline data from your environment is important to answer this question. There is no hard fast recommendation for this just as there is none for numbers of nodes in a VLAN or router is an OSPF area. This is completely dependant on your environment.
Hope this helps,
Don

VPLS and H-VPLS w.r.t Metro Ethernet

Can someone please explain me VPLS and H-VPLS as to how it can be used in a Metro Ethernet Environment????Any diagramatic explanation will be highly appreciable...
Regards,
NISHA

Thanks a lot for the presentations Harot...
As I'm a bit new to MPLS technology, I have some doubts in my mind so far Layer 3 VPNs are concerned. Let's consider a typical Scenario :
CE-->PE-->P-->P-->PE-->CE....
Could u pls tell me where MP-BGP runs (whether in PE to P or PE to CE b'coz somewhere i read the protocol used between PE-CE is MP-BGP and that's why I'm confused) and what is it's purpose. So far I know MP-BGP is run in order to make the VPNv4 routes unique i.e IPV4+VPNv4. I would highly appreciate ur feedback if u explain the layer 3 concept entirely protocol wise...i.e IGP, MP-BGP in a MPLS domain. What I know so far is CE-PE protocol can be anything right from static to BGP. P-PE is MP-BGP.
Kindly pl. correct me wherever I'm wrong...
Thanks in advance...
NISHA

Customer Equipment for Metro Ethernet Link

Hi All
It has been some time since I utilised Cisco network kit to provide private circuit point to point connectivity and I wonder if someone could give me a little guidence.
The customer is shortly to implement a new 100Mb Metro Ethernet link to connect two of their branches. They initially intend to use the link for data only traffic but eventually will want to route VOIP traffic across the link so bandwidth management and QoS will be essential components. It is unlikely that further links will be added to this link so built in expansion of the chosen routers may not be required.
Budget will be an issue on this so I would appreciate any advice or recomendations.
Thanks
J.

Hello James,
I think it would be better to get in touch with your Cisco Account Team as this question cannot be answered on a forum post.
Thanks,
Karim

Metro Ethernet implementation questions

I am planning a Metro Ethernet upgrade for a network I manage. This is the first time I’ve implemented Metro on any network. I’m looking for some suggestions and answers to a couple questions regarding this upgrade.
The current network is Hub and spoke connected by copper lines to 17 different locations from a DS3 @ our HQ. HQ also has a DS3 to the internet which the branch locations go out for internet. At our branches we have a private and public network on different subnets. Each branch location has either a T1 or bonded T1 connected to a Cisco 2801 router then to Netgear PoE managed switch(s).
The upgrade of the DS3 for internet is going to 100 meg. The data side will also be 100meg at HQ, 10meg to our small locations and 100meg to the large.
My question is what do I need to be aware of on our existing network that must change to get this working?
1)      Will I simply go from the layer2 Metro Switch to our router?
2)      Should I remove the router and go directly to the Netgear switch?
3)      Do I need to VLAN the private and public networks?
4)      Do I need to change routing tables?
Thoughts and/or suggestions welcome.
Let me know if more information is required to assist in answers.
Thanks

Hi,
I think it would be better to include Cisco Account Manager/SE for this upgrade, they can guide you better and can come up with LLD for this upgrade, otherwise upgrading your 17 sites without proper planning can cause you serious issues.
Yasir

Best way to detect failure in Metro ethernet networks

Hello ,
I am working for a well known provider and I am currently migrating one of my client from Frame-relay to Metro-ethernet link .
I am actually looking for advices on what sort of mechanism to implement to detect a failure in the ME parth .
As you probably know , failure on one of the links might cause the CE-SWITCH-PE interfaces to stay up/up and the network will not neceseraliy start converging .
So far I have implemented BFD along with IP SLA route tracking , I am happy with BFD but the IP SLA is acting "weird" .
- IP SLA ICMP tracking rely on ICMP packets and was too sensitive to packets lost
- We switched to ip route sla tracking but I am still unsure about the best way to use or implement this .
Is there some sort of best practices available somewhere for this ?
thanks ¨
T

Hello Thomas,
From what i have seen BFD is best bet as it allows to relax the L3 protocols timers ( BGP / any other protocol used between CE- PE ). Another option is to have gre tunnel between the PE - CE link and track this tunnel interface.
Regards,
Shreeram

Alerts for metro ethernet link

Hi,
Kindly let me know " How to enable alerts for metro ethernet link"
Thanks..

Hello Gureshi,
they are probably referring to OAM, CFM and other mechanisms to detect link or service failure in metro ethernet scenarios
see
http://www.cisco.com/en/US/docs/switches/metro/me3400e/software/release/12.2_52_se/configuration/guide/swoam.html
Hope to help
Giuseppe

Metro Ethernet Design question

Hello,
I was wondering how service providers guarantee their security protection in the Metro Ethernet model, especially when Internet is one of the applications used over the Metro network.
For example: The customer edge switch (3550) is connected directly to the service provider aggregation layer(either Cisco Catalyst 4500 and 6500 Series switches ) .
In the network core, Cisco 12000 or Cisco 7600 Series routers.
So where is the security devices in this architecture, where is the firewalls, the IDS/IPS, that protects the service provider core from any threats.
Providing the customer with Internet in Ethernet switching technology the service will put the provider in a vulnerable position.
Am I thinking wrong here?

Hi
The CE will be hardened using storm control both multicast as well as broadcast on the ports where the end users are connected.
About the accesiability between the other users who are connected on the ports of same switches you have switchport security coded which will take care of the access violation part.
Also the maximum no of MAC address which can be permitted/allowed over the ports.
This inturn will send u a trap and can shut the port if theres any violation detected on those ports..
In the next layer where u say 6500 or 7600 u will have FWSM modules which will be taking care of filtering and other funtionalities which is very much similar to a standalone PIX firewall.
you can have redundandcy or even load balancing with
the FWSM modules over there in the 6500 switches.
And ofcourse the IP addressing schemes deployed would be in private scopes and will have either NAT pools or PAT enabled in the FWSM.
you got to have more n more ACLS on all the devices to mitigate the general known worms/virus or their variants in the network applied in applicable points.
regds

Metro Ethernet in RAIL Transportation (MRTS) applications

Dear Sir,
I have a query related to Metro Ethernet technology.
We are into TRANSPORTATION SYSTEMS. We are coming up with a MRTS Project in Mumbai , India. We are at a planning stage at the moment. As per our experience, companies in RAIL MRTS Applications are using SDH technology (MUX and access multiplexers).
Could you please suggest , should we go for METRO ETHERNET of SDH Technology.
Are there any players/ any Metro Projects who have implemented Metro Ethernet ( instead of SDH).

Hi Pankaj
What kinda applications you are going to use and what kinda bandwidth requirement you have in place ?
Also do revert back the number of locations and a bit more onto your topology which mite help to get back with our suggestions..
regds

Base station ethernet setup?

Hello: I just bought a used v.6 Airport Express base station. B & W basic Mac, OS X.3.9. There are no internal or external wireless cards in the Mac. The Mac connects normally to home networkI want to connect the Airport Express Base station, directly to my audio receiver (RCA jacks & apple/monster kit). I reset the base station. The plan is to have internet radio transmitted to the base station from a wireless router connected to the Mac. Do I need to configure anything on the Airport Express Base station? Problems:
If I directly connect the Airport Express Base Station to the Mac, (to configure the base station), I get
-flashing yellow light on base station
-The Airport Express Setup utility appears to begin the setup, but stops, error message: "an error occured, communication with base station."
-the base station does seems to have a MAC address and internal i.d. which does appear to be read, before the setup fails.
Thank you.

What you want to do will work. The basic steps are as
follows:
- temporarily cable the ethernet port of the Airport
Express to a spare LAN port on your cabled network
- run the Airport Admin Utility on the Mac. Select
your Airport Express, click Configure. Under the
Airport tab, select the mode to "join an existing
wireless network". Specify the name (SSID) of that
wireless network, and select the same wireless
security protocol and password used by your existing
wireless network. Enable the speaker setting found
under the Music tab. Update settings to the Airport
Express
- you may then unplug the Airport Express from your
network and relocate the Airport Express next to your
sound system. You will know the Airport Express is
successfully configured, and connected to your
existing wireless network, if it shows a solid green
status light.
You cannot make use of the Airport Setup Assistant -
it only works with an Airport card equipped Mac.
Your question (how to configure an Airport Express as
a wireless client to a non-Apple wireless router) is
frequently asked here. A lot more advice and tips for
this project can therefore be found by reviewing past
discussion topics.
Thanks for reply, Henry. I'm finally able to work on this. What keywords for a search on similar setup do you suggest? "base station ethernet setup" is too broad, too many results not in line with what I want. I'll try "base station itunes stereo" too. Thanks.

Metro ethernet, Ethernet protection ring.

Hi everybody.
I hope everybody is doing great. A quick question for you guys.
Let say we have Ethernet switches connected in a ring .We want to use Ethernet protection ring for loop avoidance and faster convergence.
One of the switch will be RPL owner, and of the link in our ring will be chosen as RPL link.
1)My question is what is the criteria for RPL owner selection and RPL link? ( For e.g in STP, we use lowest bridge priority for root bridge)
2) Is Ethernet protection ring provide an alternative to stp when we switches connected in ring toplogy and fast convergence is required as is the case with metro ethernet commonly ?
Have a great evening.

Dear Friend
If you want to deploy and use L2 VPN service you should
define whst is he type of core
do you want to use L2 VPN service based on IP or MPLS?

Metro Ethernet vs Leased line

Guys,
I'm setting a proposal for WAN link. there will 2 option, 45 MB leased line and 100 Metro ethernet. I need to know what is the pro/cons for this 2 technology as i need to explain to the customer.
Do anybody have a link or explaination on this?
Thanks
Rezzo

WAN vs Metro
1) Future BW Expansion : Metro-E BW expansion is as very easy compared to adding leased circuits to the WAN.
2) Service levels : Since Metro-E is a service it has better service levels than a traditional WAN link.
3) Finally Cost: In most cases the BW cost derived per Leased Circuit to that of Metro-E Link is higher in most places.
What may make the choice of WAN more practical is the availability of WAN only and no Metro service in a area.
Plus if the customer is not at all comfortable with a shared infrastructure link like Metro-E.
HTH-Cheers,
Swaroop

Comcast Metro Ethernet Setup

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