When you have a full mesh of tunnels among PE routers, the split horizon group
(SHG) of these tunnels should be set to a non-zero value, e.g. 1, to prevent
loops. Thus, packets received from an interface with a non-zero SHG will not be
replicated or broadcasted to another interface in the bridge with the same SHG
value. The SHG of an interface in a bridge can be set when you put an
interface in a bridge:
DBGvpp# set int l2 bri ?
set interface l2 bridge set interface l2 bridge <interface>
<bridge-domain-id> [bvi] [shg]
If SHG is not specified, it defaults to 0.
Regards,
John
From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of Gulakh
Sent: Monday, July 16, 2018 9:05 AM
To: vpp-dev@lists.fd.io
Subject: [vpp-dev] vpls bridge mac learning
Hi,
I have configured a scenario in which I have 3 routers that they form a full
mesh network i.e. each of which connected directly to others.
Now each router have one bridge to which one physical interface and two mpls
tunnels are connected.
Now I connect a PC to the physical interface of one router and then use "show
l2fib verbose" to see the learnt MACs.
As far as I know, this command should have displayed that the PC's MAC is
learnt from the physical interface, but to my surprise it is alternating
between mpls_tunnel0 and mpls_tunnel1
here is the log:
DBGvpp# sh l2fib verbose
Mac-Address BD-Idx If-Idx BSN-ISN Age(min) static filter bvi
Interface-Name
3c:07:71:5f:2d:f5 1 10 3/3 - - - -
mpls-tunnel0
L2FIB total/learned entries: 1/1 Last scan time: 1.8002e-3sec Learn limit:
4194304
DBGvpp# sh l2fib verbose
Mac-Address BD-Idx If-Idx BSN-ISN Age(min) static filter bvi
Interface-Name
3c:07:71:5f:2d:f5 1 11 3/3 - - - -
mpls-tunnel1
I guess that when PC is connected to router, It first sends an ARP message that
is broadcasted in the network, in other words, the two other router's bridge
are receiving this ARP message from their corresponding mpls_tunnel and then
they broadcast it again.
Finnaly I think that router is receiving its own ARP packet from other bridges
and shows that PC's MAC address is being learnt from those connected tunnels
alternately.
My scenario is somehow like the attached image but I have only one customer
e.g. the Yellow customer.
Q1: Am I right?? If yes, How to solve this problem?? If no, What is the
problem??
When I ping two PCs of the customer using this VPLS, most of the ICMP packets
are dropped. I think that this is the effect of the above mentioned ARP problem.
Q2: Am I right??
Thanks
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