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RE: Overconfiguration posted 07/08/2005
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Agree totally.  Know the reason why you would want to enable or disable, then explicitly do so.  But it is nice to know when your checking your configuration using "show run" what will and will not show up by default.

Jerry

-------------- Original message -------------- 

> it is always best to just put the command in, no bgp, no split horizon, or bgp 
> sync, split.... 
> 
> Never try to rely on the defaults, you get use to them, then if there is a 
> change and they are running an IOS OR they have pre-set a change to the default, 
> you are screwed and in a rat hole trying to figure out what the hell is going 
> on. ALWAYS put the command in, it takes 5 seconds off your time, but well worth 
> it. 
> 
> jm 
> 
> -----Original Message----- 
> From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx]On Behalf Of 
> hulbertj@xxxxxxxxxxx 
> Sent: Friday, July 08, 2005 10:47 AM 
> To: Godswill Oletu; Marcus; ccielab@xxxxxxxxxxxxxx 
> Subject: Re: Overconfiguration 
> 
> 
> Marcus, 
> 
> Isn't "no bgp synchronization" enabled by default now on routers with 12.2T. On 
> 3550's, I believe it's still disabled. 
> 
> Rack1R2(config)#router bgp 100 
> Rack1R2(config-router)#do sho run | b bgp 
> router bgp 100 
> no synchronization 
> bgp log-neighbor-changes 
> no auto-summary 
> 
> Rack1SW2(config)#ip routing 
> Rack1SW2(config)#router bgp 100 
> Rack1SW2(config-router)#do sho run | b bgp 
> router bgp 100 
> bgp log-neighbor-changes 
> 
> Rack1SW2(config-router)#no synchronization 
> Rack1SW2(config-router)#do sho run | b bgp 
> router bgp 100 
> no synchronization 
> bgp log-neighbor-changes 
> 
> 
> Jerry 
> 
> -------------- Original message -------------- 
> 
> > Marcus, 
> > 
> > Look at your list again, I will disagree with a number of them. Share your 
> > opinions if you disagree.... 
> > 
> > 1. 'frame-relay map .....broadcast' 
> > This is an absolute must at the hub, if you want to pass any routing 
> > protocol accross and offcourse in the CCIE Lab, you will want this to occur. 
> > 
> > 2. 'ip ospf demand-circuit' 
> > I will agree with you on this. This is only require on one side of the Link. 
> > 
> > 3. 'dialer load-threshold' 
> > I will also agree with you on this. 
> > 
> > 4. 'no bgp synchronization' 
> > This really depend on the wording of your Lab, there are some occasions 
> > where you will not be told to turn it off, but to meet certain goals of the 
> > Lab, you must turn it off. It is just like having a Lab scenerio like: 
> > 
> > 'Configure a multipoint hub and spoke frame relay network, ensure full 
> > routing reachability for all routers using EIGRP' 
> > 
> > Nothing in that scenerio tell you to turn off 'split horizon', but to 
> > achieve 'full routing reachability', in addition to other configurations, 
> > split horizon must be turned off. 
> > 
> > 5. 'backup interface/dialer-watch only on one side' 
> > One do not necessary need these on both sides of the link, except your 
> > scenerio calls for it. 
> > 
> > Thanks. 
> > Godswill Oletu 
> > 
> > ----- Original Message ----- 
> > From: "Marcus" 
> > To: 
> > Sent: Friday, July 08, 2005 7:58 AM 
> > Subject: Overconfiguration 
> > 
> > 
> > > Hi, 
> > > if you have two children, would you let them go diving with only one 
> > > bottle of air, just because it is sufficient? 
> > > Someday someone might change one router or it's config. It might be 
> > > helpful in that case to have redundant configurations. 
> > > 
> > > I found the following topics that could be overconfiguration: 
> > > - "frame-relay map broadcast" on the hub because it does not forward 
> > > broadcasts 
> > > - "ip ospf demand-circuit" on both sides of the link 
> > > - "dialer load-treshold" on both sides 
> > > - turning off bgp synchronization if not asked 
> > > - backup interface/dialer-watch only on one side 
> > > 
> > > Are there other examples? 
> > > Do you really loose points using these commands too much? 
> > > 
> > > Regards, 
> > > Marcus 
> > > 
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