Thanks so much dre! Regarding GARP, someone said I had to cover it, but didn't explain why or even what it is. It seems to mean more than one thing:
Generic Attribute Registration Protocol and Group Address Resolution Protocol I'm assuming they meant the second one and that the second GARP is somewhat of a replacement for IGMP snooping and CGMP? But I'm still trying to figure it out. Your comments are very helpful. Priscilla dre wrote: > > ""Priscilla Oppenheimer"" wrote > > I may be starting a new project doing some writing about > > technologies used in enterprise networks. (read not service > > provider) > > > > Do I need to cover IS-IS? Or is it mainly ISPs that use this? > > I've never seen IS-IS in Enterprise networks, only ISP > backbones and CODCN's (Central Office Data > Communications Networks) that implement OSI stacks on > network elements. The primary reason I've heard (I'm an > IS-IS fan working in the Enterprise), that also happens to > be a sort of compelling argument - is that OSPF and > EIGRP work better through firewalls. I believe that IS-IS > is significantly less complex than OSPF or EIGRP, and > therefore, easier to train/learn, implement, manage, etc. > > > How about MPLS? I should discuss it briefly, but aren't > > the main users of MPLS ISPs, not enterprise networks? > > I've only seen MPLS in ISP networks, but could be used > in Enterprise, especially simple VRF concepts (from > MPLS VPN's). I could see many reasons that Enterprises > could use even static route VRF's for various useful purposes > on occasion, but even that is a rarity. Of course, I'm also of > the opinion that MPLS doesn't really belong in SP networks > either - so YMMV. MPLS-TE is still being argued among > the SP network guru's. MPLS FRR (Fast Re-Route) is an > important network protection and resliency technology and > should be researched, tested, and implemented when the > need arises for it (including for Enterprises). > > > Anyone using GARP? That's on my list to research too. > > GARP, as in Multicast? Many Enterprises are using > Multicast, but their use can vary depending on the > company (could be for reliable multicast like TIBCO, or > could be for live broadcasting sending/receiving, or > research, or many other technical/business reasons). > Understanding the basics is good, but it's hard to cover > all the advanced topics in IP Multicast because it's such > a point application as it is already. > > > Alas, I have a lot to learn. Thank-you VERY much > > for answering these quick questions. > > You will probably want to look at this from a specific industry > perspective, i.e.: > > High-Tech Manufacturing / Hardware/Software Engineering > Pharmaceuticals > Automotive, Consumer Goods > Government / Political / Federal vs. State/County/City > Defense / Military / Aerospace > Education > Banking / Securities / Financials / Real-Estate > Insurance Companies > Entertainment > Retail > Health Care > Hospitality / Transportation > Energy > > Certain companies have totally different needs > technology-wise... > in particular, some business build networks without latency in > mind > because they are a state-wide organization, or even a city-wide > organization. Some companies have networks that span the globe, > and some have the same type of need in a mission-critical way. > There are many technologies that apply to certain companies and > not others. > > For any large Enterprise that relies on IT to be > mission-critical, > figure that the cost of IT downtime is significant (Meta Group > 2001 report shows $1.5M per hour of downtime). IT relies on > the Internet for growth and technology. Data centers, > especially > Internet data centers are the key point to any IT > infrastructure. > The primary technologies in these environments are rapidly > shifting. Many organizations are now required to, or at the > very > least are planning to, add more than one primary data center for > 100%, near-instantaneous continuous operation / disaster > recovery. You will see this in the High-Tech industry because > of maturity, and you will see it in the Government/Defense > industries because of things like the Homeland Security Act > (signed November 25th, 2002). The same Meta group report > shows that 70-75% of mid- to top-tier applications will be > distribued across at least two data centers by 2003. I got this > information from: > http://www.cisco.com/global/EMEA/networkers/presentations/NSC-284_Reiner_Dre > sbach.pdf.gz > > Because of the need for distributed data centers, technologies > such as: > > BGP-4 (and therefore IP address management/globalization, > as well as Peering and Carrier-Neutral co-location) > Content Networking (RHI, E-CDN, DNS/HTTP-routing) > Optical Networking (DWDM, Optical Ethernet, RSTP) > Virtual Private Networking (to include Site-to-Site VPN, > Remote Access User VPN - both over the Internet and on > private networks, as well as CE MPLS VPN) > Security (I see this more as host security, then network > security, but YMMV) > > will become increasingly important for Enterprises. More > importantly, they will want to increase availability and > performance of 3-tier applications (front-ends, application > servers, and database servers), while also making them > global and distributed. This will have a very serious impact > on the networking technologies and industry best practice > methods. > > Also big for Enterprises will be technologies that represent > significant ROI with quick and easy Break-Even points, etc. > > i.e.: > IP Telephony (SIP, Unified Messaging, CallManger, Unity) > Network Management / OSS / Automation > > 3-Tier Applications are really big in large Enterprises, and > there are only a few current methods of implementing them. > IBM - pSeries (AIX/Linux) + Websphere + DB2 > Sun - Ultra (Solaris) + BEA WebLogic + Oracle 9i > Microsoft - HP or Dell (NT server) + .NET + MS SQL > > Some people do multi-vendor mix 'n match, but that is the > general idea. What's even funnier is look at this model: > > Largest Enterprise (Fortune 500) -> IBM > Other Large Enterprises -> Best Practice (Sun+BEA+ORA) > Enterprise businesses -> Cheapest (Microsoft+Dell) > > The nice thing about being a Network engineer is that you are > often stuck with Cisco (only other choices are really Juniper, > Foundry, Extreme, Riverstone - who don't have solutions, > only point products), but any basic Cisco network will nicely > support any of the three most popular 3-tier application > niches (or any variant). The network requirements don't > change, so it's much easier to sell/implement/fund/support/etc. > > Do a search on CCO (logged in with a customer account) > for "SRND" and read all those PDF's. You will see what an > Enteprise might need today. In reality, these technologies are > going to represent significant cost savings for Enterprises, > however, they will have to consider that more spending will > occur in the short-term (CAPEX often leads to lower > future OPEX), but many businesses are especially thinking > about long-term viability in this current economy (funny how > things work that way). The ROI on IP Telephony alone can > represent such significant savings, it's very logical for > Enterprises to move to all sorts of complex networks that > require new business units to build and support (yet that > still manage to consistently meet break even points, etc). > > What is it that you are working on? > > - dre > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=58511&t=58493 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
