[c-nsp] Loopback/VLAN question

[Frank Bulk - iName.com]

I have 5 remote sites where I'm doing FTTH and transporting the traffic over
a third-party transport gear to our HQ.  Each site-HQ link is a separate
VLAN and uniquely numbered.  My preference is to burn up only one port on
the Cisco 7609-S (RSP720-3C with WS-X6748-DFC3C) and transport gear by
trunking the traffic between the two boxes.  But I don't want to have a
separate IP address pool (with associated static IP /24 and web filter /24)
for each remote site.  I would like each remote site to use the same address
pool.  So I'm looking for something like IRB.

SiteA  SiteB  SiteC  SiteD  SiteE
  |      |      |      |      |
VLAN1  VLAN2  VLAN3  VLAN4  VLAN5
  |      |      |      |      |
  =============================
                |
	802.1q tagged (1 thru 5)
                |
             7609-S
                |
	     DHCP server

I could use the transport gear's VLAN-translation and drop off each site
into their own physical port on the 7609-S but have it be the same VLAN, but
that's burning more ports on both boxes than what I would like.

But perhaps I have to use separate IP address pools for each remote site.
That would have the benefit of reducing the L3-broadcast traffic.

Frank

-----Original Message-----
From: Arie Vayner (avayner) [mailto:avayner at cisco.com] 
Sent: Tuesday, December 15, 2009 1:32 PM
To: frnkblk at iname.com; cisco-nsp at puck.nether.net
Subject: RE: [c-nsp] Loopback/VLAN question

Frank,

Can you please explain what do you want to achieve?
I think this should be done in a different way.

Also, what HW do you have?

Arie

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Frank Bulk -
iName.com
Sent: Tuesday, December 15, 2009 20:19
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Loopback/VLAN question

I have several uniquely numbered 802.1q tagged links coming into a Cisco
7609-S (12.2(33)SRB3) on a single physical port.  I would like to use
the
same group of subnets for each VLAN and I tried using loopbacks but it
doesn't work.  Any ideas on what I'm doing wrong?

interface Loopback 2
 ip dhcp relay information trusted
 ip dhcp relay information option-insert none
 ip dhcp relay information policy-action keep
 ip address a.b.c.1 255.255.255.0
 ip address a.b.d.1 255.255.255.0 secondary
 ip address a.b.e.1 255.255.255.0 secondary
 ip helper-address w.x.y.z
 arp timeout 300

interface Vlan10
 ip unnumbered loopback 2
 ip dhcp relay information trusted
 ip dhcp relay information option-insert none
 ip dhcp relay information policy-action keep
 ip helper-address w.x.y.z

interface Vlan11
 ip unnumbered loopback 2
 ip dhcp relay information trusted
 ip dhcp relay information option-insert none
 ip dhcp relay information policy-action keep
 ip helper-address w.x.y.z

interface GigabitEthernet1/1
 switchport
 switchport trunk encapsulation dot1q
 switchport trunk allowed vlan 10, 11
 switchport mode trunk
end

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