Network Ring

VINAY BANNAI bannai at
Mon Sep 7 06:32:02 UTC 2009

There are several ring technologies that are interesting but again it depends on what services you are planning to run and what kind of SLA guarantees  you need: 

- RPR (802.17) : This has quieted down but it is a fairly robust technology giving you packet rings with 50ms, CoS, fairness and upto 255 nodes in a ring 

- EAPS: This technology is more vendor specific (eventhough an informational RFC exists)

- ERPS (G.8032 - ITU) : This standard from ITU folks supports ethernet based packet rings and is comparable to EAPS

- SONET/SDH : This is tried and tested but do you want to deploy a TDM based technology if most of your traffic is packet based

- MPLS/VPLS : This is a layer 3 based and may not work for pure layer 2 service providers. It is tried and tested but does have some operational complexity built-in compared to layer 2 based technologies

I agree with an earlier suggestion made, do not mix vendors if you want service level interoperability.  

Vinay Bannai

Email : bannai at

--- On Sun, 9/6/09, ty chan <chanty_kh at> wrote:

From: ty chan <chanty_kh at>
Subject: Re: Network Ring
To: "jamie" <j at>
Cc: nanog at
Date: Sunday, September 6, 2009, 9:52 PM

Only one vendor will be chosen.

From: jamie <j at>
To: ty chan <chanty_kh at>
Cc: nanog at
Sent: Monday, September 7, 2009 11:51:17 AM
Subject: Re: Network Ring

Step 1: Don't mix vendors.  Period.

On Sun, Sep 6, 2009 at 11:14 PM, ty chan <chanty_kh at> wrote:

Dear all,
>>I am in process of planning ring network to cover 15 POPs in City. Some technologies are chosen for consideration like SDH(Huawei), PVRST+(Cisco), RSTP(Zyxel), EAPS (extreme network) and MPLS(VPLS). The purpose is to provide L2 Ethernet connectivities from POPs to central point (DC) and ring protection.
>>I know you all are in those network for years. can you give me some advises?
>>Best regards,

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