[nsp] Bridging?

[Vincent De Keyzer]

Bruce,

thank you so much! PPP half-bridging is exactly what I am trying to achieve.

Now Serial0/0:0 is up (ppp neg complete), but there is a MAC address
problem: when I am trying to ping from the Ethernet host, here is what I see
on the E1 router:

*Mar  1 23:54:03.006 CET: IP ARP: rcvd req src 10.159.159.202
0006.d6ca.4800, dst 10.159.159.201 Serial0/1:0
*Mar  1 23:54:03.010 CET: IP ARP: creating entry for IP address:
10.159.159.202, hw: 0006.d6ca.4800
*Mar  1 23:54:03.010 CET: %IP-4-ZERO_ADDR: Zero MAC address for
10.159.159.201 in ARP cache
2621#sh arp | i 10.159.159.20
Internet  10.159.159.202          2   0006.d6ca.4800  ARPA   Serial0/1:0
2621#

Config is as follows:

2621#sh ru int s0/1:0
Building configuration...

Current configuration : 121 bytes
!
interface Serial0/1:0
 ip address 10.159.159.201 255.255.255.252
 encapsulation ppp
 no cdp enable
 ppp bridge ip
end

2621#

So it seems that it does not work because there is no MAC address assigned
to this serial interface.

How can I assign one?...

Vincent


> -----Original Message-----
> From: Bruce Pinsky [mailto:bep at whack.org] 
> Sent: mercredi 28 avril 2004 23:09
> To: Vincent De Keyzer
> Cc: cisco-nsp at puck.nether.net; 'Todd, Douglas M.'
> Subject: Re: [nsp] Bridging?
> 
> 
> Vincent De Keyzer wrote:
> 
> > Douglas,
> > 
> > your efforts to understand my problem are remarkable and I highly 
> > appreciate them.
> > 
> > But I haven't been clear enough once again (I could say 
> it's because 
> > english is not my mother language, but I am not sure I 
> could do better 
> > in french... :) so let me
> > try another way.
> > 
> > IP ranges:
> > A.B.1.0/24: backbone ranges
> > A.B.2.0/24: PtP (/30) ranges
> > A.B.3.0/24: customer X range
> > A.B.4.0/24: customer Y range
> > 
> > Current situation:
> > * a 2621 with
> > Fa0/0 = A.B.1.2/28
> > Serial 0/0:0 = A.B.2.1/30 for customer X
> > Serial 0/1:0 = A.B.2.5/30 for customer Y
> > * customer X has a 1600+CSU/DSU with
> > Serial0 = A.B.2.2/30
> > Ethernet0 = A.B.3.1/24
> > * customer X has a firewall with
> > WAN = A.B.3.2/24
> > * customer Y has a 1600+CSU/DSU with
> > Serial0 = A.B.2.6/30
> > Ethernet0 = A.B.4.1/24
> > * customer Y has a firewall with
> > WAN = A.B.4.2/24
> > 
> > The 2621 is routing IP packets between customer ranges 
> A.B.3.0/24 and 
> > A.B.4.0/24 and the core network behind Fa0/0.
> > 
> > And, after replacing the (1600+CSU/DSU) by a E1/Eth bridge, I would 
> > like it to become:
> > * a 2621 with
> > Fa0/0 = A.B.1.2/28
> > Whatever0 = A.B.3.1/24
> > Whatever1 = A.B.4.1/24
> > * customers X&Y have an E1/Eth bridge and their FWs keep the same 
> > config
> > 
> > ... where "Whatever" interfaces are whatever kind of interface it 
> > takes to have this working...
> > 
> > Now maybe this is now even called bridging... but is it possible?
> > 
> > The goal is of all this is to replace 1600+CSU/DSU by less 
> expensive 
> > equipment where it's not required.
> > 
> 
> Sounds like you want PPP half-bridging.   See: 
> http://www.cisco.com/en/US/partner/products/sw/iosswrel/ps1831
/products_configuration_guide_chapter09186a00800d9845.html#1001479

So at the customer site, you need an E1/Eth bridge that does PPP on the E1 
side.

-- 
=========
bep

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