Well I figured I took do with the pratice. After a couple of slip-ups I
think I finally got it right. In mocking this up on my lab I've come to two
conclusions. The only way I got routerA to advertise 10.1.0.0/24 was witht
he command
"network 10.1.0.0 mask 255.255.255.0"
I attempted to use the 10.1.0.0 network command but this did nothing to
advertise the subnet in BGP. I tried a couple variations of the command and
nothing meet the requirements of the question. Also, the only way that the
route was advertised was by the configuration of the loopback 0 interface,
listed is the main config statements;
nterface Loopback0
ip address 10.1.0.1 255.255.255.0
no ip mroute-cache
!
interface Ethernet0
ip address 152.1.1.1 255.255.255.0
no ip mroute-cache
no mop enabled
!
interface Serial0
ip address 192.1.1.1 255.255.255.0
no ip mroute-cache
!
router bgp 100
no synchronization <--this is optional as it applies to the problem
bgp log-neighbor-changes
network 10.1.0.0 mask 255.255.255.0
network 152.1.0.0
network 192.1.1.0
2501_RouterA#sh ip bgp
BGP table version is 4, local router ID is 10.1.0.1
Status codes: s suppressed, d damped, h history, * valid, > best, i -
internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 10.1.0.0/24 0.0.0.0 0 32768 i
*> 152.1.0.0 0.0.0.0 0 32768 i
*> 192.1.1.0 0.0.0.0 0 32768 i
So based on this it would seem that the question does not provide us with a
correct option. as called for in the question "10.1.0.0/24"
Anyone else took a look at this.. Or got it work any other way?
Nigel.
>From: "Chuck Larrieu" <[EMAIL PROTECTED]>
>Reply-To: "Chuck Larrieu" <[EMAIL PROTECTED]>
>To: "Jay Hennigan" <[EMAIL PROTECTED]>
>CC: "Peter Abraham" <[EMAIL PROTECTED]>, <[EMAIL PROTECTED]>
>Subject: RE: BGP **** CCO QUESTION ** PA
>Date: Sun, 24 Sep 2000 09:21:44 -0700
>
>Saved this one until I could take a look on a router. Some comments within:
>
> >1. Which command allows Router A to advertise subnet 10.1.0.0/24 in BGP?
> >
> > A. network 10.1.0.0
> > B. network 10.1.0.0 255.255.0.0
> > C. network 10.1.0.0 mask 255.255.0.0
> > D. network 10.1.0.0/16
>* E. network 10.1.0.0 prefix 16
>
>We've already determined that B, D, and E are illegal commands
>
>A, which I mistakenly believed would work does not do anything on my
>router.
>
>Router_3#sh ip bgp
>BGP table version is 7, local router ID is 3.3.3.3
>Status codes: s suppressed, d damped, h history, * valid, > best, i -
>internal
>Origin codes: i - IGP, e - EGP, ? - incomplete
>
> Network Next Hop Metric LocPrf Weight Path
>*> 192.167.9.0 0.0.0.0 0 32768 i
>*> 199.199.199.0 0.0.0.0 0 32768 I
>
>IP Classless was configured.
>
>Relevant parts of the config:
>
>interface Loopback0
> ip address 10.1.1.1 255.255.0.0
>!
>interface Loopback1
> ip address 192.167.9.1 255.255.255.0
>!
>interface Loopback4
> ip address 199.199.199.1 255.255.255.0
>
>router bgp 100
> no synchronization
> bgp router-id 3.3.3.3
> network 10.1.0.0
> network 192.167.9.0
> network 199.199.199.0
>!
>ip classless
>ip route 0.0.0.0 0.0.0.0 Serial1
>
>yes I did a clear ip bgp * between config changes
>
>
>-----Original Message-----
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Jay
>Hennigan
>Sent: Monday, September 18, 2000 7:20 PM
>To: Chuck Larrieu
>Cc: Peter Abraham; [EMAIL PROTECTED]
>Subject: RE: BGP **** CCO QUESTION ** PA
>
>On Mon, 18 Sep 2000, Chuck Larrieu wrote:
>
> > Having just exited a three day Global Knowledge class on BGP, let's see
>if
> > anything sunk through this thick skull of mine. Comments in line.
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of
> > Peter Abraham
> > Sent: Thursday, September 14, 2000 2:02 PM
> > To: [EMAIL PROTECTED]
> > Subject: BGP **** CCO QUESTION ** PA
> >
> > All these are questions that I got from the CCO BCSN tests.
> >
> > 1. Which command allows Router A to advertise subnet 10.1.0.0/24 in BGP?
> >
> > A. network 10.1.0.0
> > B. network 10.1.0.0 255.255.0.0
> > C. network 10.1.0.0 mask 255.255.0.0
> > D. network 10.1.0.0/16
> > E. network 10.1.0.0 prefix 16
> >
> > I have my answer as A. B,D, and E all have the wrong syntax. Is C
>right?
>I
> > know that the mask length for C is 16.
>
>Jay H:I would choose C. The wording of the question is "allows Router A to
>advertise". Note that none of the answers LIMIT the advertisement to
>just the subnet 10.1.0.0/24. If no mask is specified, BGP assumes a
>classful network. Answer A has no mask, so should properly be written
>"network 10.0.0.0". C is the only properly-formatted answer which
>would allow the /24 subnet. It would also allow any other subnets of
>10.1.0.0/16 to be advertised, which is ok.
>
>CL: folks as literal minded as myself often outsmart themselves with
>questions like this. Kinda like my network 0.0.0.0 255.255.255.255 area 0
>or
>network 172.16.1.1 172.16.1.1 area 0 propositions in OSPF. There is an
>answer that does what the question asks, plus a whole lot more.
>
>Note: even assuming BGP defaults to the classful boundary, the network
>10.0.0.0 does NOT appear in the BGP table if the network statement
>indicates
>10.1.0.0
>
><<snip for brevity>>
>
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