From: Mike Ollington (Mike.Ollington@uk.didata.com)
Date: Tue Dec 06 2005 - 05:53:14 GMT-3
I did that task slightly differently as well - using only the ATM peer
matching _54$ and setting local preference high and for all other
prefixes setting local preference lower than 100.
Router bgp 100
Neighbor 54.1.7.254 route-map BB1 in
ip as-path access-list 1 permit _54$
route-map BB1 permit 10
match ip as-path 1
set local-preference 110
route-map BB1 permit 20
set-local-preference 90
I think where I might be caught is lack of definition in seq 20 of the
route-map although this would catch all customers of BB1 and their
transit routes.
Point 2 - There are couple of requirements in the IGP section that mean
the next-hop for all prefixes coming from the ATM are not installed. If
you don't test for reachability with a ping it's possible that this
might be missed. It's implicit in the labs that all addresses should be
pingable - Lab 6 IE workbook explicitly says some BGP prefixes will be
unreachable from the non-BGP speakers.
Point 3 - The way the answer guide and the forum read, I think the
question was a lot fuller and then VoIP was removed from the CCIE lab.
I started off building a QoS policy using NBAR but saw the answer guide
referred to a specific host as did the requirement - 'from the voice
gateway beyond BB2'.
Point 4 - R3 isn't part of the voice domain so is only left at default
Bc although with that number Tc ends up as something like 70ms? I
didn't set the Bc for the R3 to R5 PVC.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Nadeem Zahid (iszahid)
Sent: 06 December 2005 06:15
To: ccielab@groupstudy.com
Subject: IE Lab 7 - more questions
Lab 7 BGP task 6.7-6.10
1. Solution uses this method:
router bgp 100
neighbor 54.1.7.254 route-map BB1 in
neighbor 204.12.1.254 route-map BB3 in
!
ip as-path access-list 54 permit _54$
!
route-map BB1 permit 10
match as-path 54
set local-preference 200
!
route-map BB1 permit 20
!
route-map BB3 permit 10
match as-path 54
!
route-map BB3 permit 20
set local-preference 200
Whereas I use this method:
router bgp 100
neighbor 54.1.7.254 route-map AS54 in
neighbor 204.12.1.254 route-map AS54_CUSTOMER in
!
ip as-path access-list 1 permit ^54$
ip as-path access-list 2 permit _54$
!
route-map AS54 permit 10
match as-path 1
set local-preference 200
!
route-map AS54 permit 20
!
route-map AS54_CUSTOMER permit 10
match as-path 2
set local-preference 200
!
route-map AS54_CUSTOMER permit 20
Just wondering if that is ok?
2. Task 6.12:
When ths question aks that make sure we have *reachability* to the BGP
prefixes,
what does that mean in the lab? Does that mean that they are in BGP
table and "one way" traffic
can be sent" or does that mean they must be pingable?
3. QOS: Task 9.1-9.5
I don't know how the address of voice-gateway was determined in the ACL
as 220.20.3.192?
It's not known anywhere.
Task: 9.6-9.9
It is understandable that Bc = 7680 for min 10mSec Tc.
Can someone explain how the Bc for R3 came out to be 48384?
thnx
Nadeem
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