The MAC address ad:ef:ad:ef:de:ad is a multicast address. That’s why packet
with that destination MAC is flooded in the bridge. Try assign a unicast MAC
address to gtpu_tunnel1.
Regards,
John
From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of sunny cupertino
Sent: Friday, February 14, 2020 9:34 PM
To: vpp-dev@lists.fd.io
Subject: [vpp-dev] L2 Bridge question on forwarding
Hi All,
I request your help on L2 Bridge in VPP. I wanted to know if we can selectively
forward L2 packets
to different interfaces on a bridge based on the ethernet address.
For e.g there is one interface and 2 GTPU tunnels on a L2 bridge.
I have added an entry into the L2 Fib table telling which interface to use for
that
particular ethernet address (ad:ef:ad:ef:de:ad ).
vpp# show l2fib verbose
Mac-Address BD-Idx If-Idx BSN-ISN Age(min) static filter bvi
Interface-Name
ad:ef:ad:ef:de:ad 1 4 0/0 no - - -
gtpu_tunnel1
01:00:5e:00:00:fb 1 2 0/1 - - - -
gtpu_tunnel0
de:ad:be:ef:de:ad 1 2 0/1 - - - -
gtpu_tunnel0
28:f1:0e:4e:c2:be 1 3 0/5 - - - -
tap210
but when the packets arrive on tap210 they are sent to both tunnel1 and tunnel0
as well.
I tried to switch off the flooding, in which case the packets are dropped
saying L2 forward
feature is not enabled. I request you to kindly let me know if this is
possible at all to
achieve.
Thanks a lot,
Here some information about setup.
vpp# show bridge 3 detail
BD-ID Index BSN Age(min) Learning U-Forwrd UU-Flood Flooding
ARP-Term BVI-Intf
3 1 0 off on on flood on
off N/A
Interface If-idx ISN SHG BVI TxFlood
VLAN-Tag-Rewrite
tap210 3 5 0 - * none
gtpu_tunnel0 2 1 0 - * none
gtpu_tunnel1 4 3 0 - * none
vpp#
trace:
Packet 1
01:08:35:178099: virtio-input
virtio: hw_if_index 3 next-index 4 vring 0 len 1516
hdr: flags 0x00 gso_type 0x00 hdr_len 0 gso_size 0 csum_start 0 csum_offset
0 num_buffers 1
01:08:35:178102: ethernet-input
IP4: 28:f1:0e:4e:c2:be -> ad:ef:ad:ef:de:ad 802.1q vlan 4 priority 4
01:08:35:178104: l2-input
l2-input: sw_if_index 3 dst ad:ef:ad:ef:de:ad src 28:f1:0e:4e:c2:be
01:08:35:178106: l2-learn
l2-learn: sw_if_index 3 dst ad:ef:ad:ef:de:ad src 28:f1:0e:4e:c2:be bd_index 1
01:08:35:178109: l2-flood
l2-flood: sw_if_index 3 dst ad:ef:ad:ef:de:ad src 28:f1:0e:4e:c2:be bd_index 1
l2-flood: sw_if_index 3 dst ad:ef:ad:ef:de:ad src 28:f1:0e:4e:c2:be bd_index 1
01:08:35:178111: l2-output
l2-output: sw_if_index 4 dst ad:ef:ad:ef:de:ad src 28:f1:0e:4e:c2:be data 81
00 80 04 08 00 45 00 05 da 19 bf
l2-output: sw_if_index 2 dst ad:ef:ad:ef:de:ad src 28:f1:0e:4e:c2:be data 81
00 80 04 08 00 45 00 05 da 19 bf
01:08:35:178113: gtpu4-encap
GTPU encap to gtpu_tunnel1 teid 7
GTPU encap to gtpu_tunnel0 teid 3
01:08:35:178115: ip4-load-balance
fib 4 dpo-idx 1 flow hash: 0x00000005
UDP: 192.168.50.40 -> 192.168.50.10
tos 0x00, ttl 254, length 1552, checksum 0xd159
fragment id 0x0000
UDP: 11189 -> 2152
length 1532, checksum 0x0000
fib 2 dpo-idx 1 flow hash: 0x00000005
UDP: 192.168.50.40 -> 192.168.50.10
tos 0x00, ttl 254, length 1552, checksum 0xd159
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