Couple of CCIE lab questions for experts

Hi,

since I'm going through the prep for CCIE R&S I'm writing down some
questions to ask you guys:

1. QINQ - In scenario where you have R1 router connected on SW1 and R2
router connected in SW2, and connection of switches goes like this
R1--SW1---SW3---SW4---SW2---R2. Task is to configure dot1q tunnel
(QinQ). Routers R1 and R2 have subinterfaces, one in VLAN 12 and the
other in VLAN 34. Routers are connected to appropriate switches to
access port in VLAN 12. After configuring that access port as dot1q
tunnel I have communication between R1 and R2 through both VLAN 12 and
VLAN 34. My question is, how come that service provider's VLAN 12
(access port on SW1 and SW2) doesn't get in the way for customer VLAN
12 (R1 and R2 are customer routers)?

2. FALLBACK BRIDGING - I have simple configuration for fallback
bridging of IPX traffic. As I understood, NO BRIDGE 1 ACQUIRE should
not forward packets to dynamically learned MAC addresses. On my 3560
that doesn't work. My traffic is still forwarded. Are there some
tricks or is just the bug?

3. FRAME RELAY MAPPING - simple scenario where I have R1 as hub and
R2, R3 as spokes. Task is to configure p2p links R1-R2 and R1-R3. As I
understood, inverse ARP will be activated when you put IP adress on
MAIN interface. As long as you are using subinterfaces there is no
need to put NO FRAME INVARP. So, I configured R1 with p2p subint and
IP add. I started configuring R2: configured ENC FRAM under main int,
made p2p subint and when I wanted to put FRAME INTERF-DLCI on my R2's
p2p subint msg says that my DLCI is already mapped to main interface?
Why?

4.PPP MULTILINK - you have 2 connections between two routers, FR
connections and you wanna configure multilink authentication. My
learning materials say that you have to configure ppp auth under
virtual template. I configured under multilink int and it works.
Question is: is the right way under virtual-temp or ppp auth can be
configured under multilink int?

5. RIPv2 over FR - simple scenario, one hub and two spokes. Hub has
multipoint subint and spokes have ip addresses under main interface.
All three routers have one loopback which is advertised via RIPv2. I
didn't put BROADCAST keyword in the mapping line just to see what will
happened. My spokes exchange routing updates, so one spoke knows about
other's loopback and vice verse.
Hub router doesn't get any update. What is the reason for that behavior?

OK. I got number 5 question. My spokes learn about each other via
dynamic mapping which has BROADCAST feature on. :)

That's it for now. Thanks.

Regards

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Received on Tue Feb 16 2010 - 19:21:37 ART