[EVPN VXLAN] Only one vni to vlan map entry in the output of show vxlan tunnel command

[dellwuchuan]

Description

When there are many vlan to vni mapping entries, there are only one founded in the output of show vxlan tunnel command.

Steps to reproduce the issue:

1. Configure vxlan at dut

sudo config vxlan add vtep101032 10.1.0.32
sudo config vxlan evpn_nvo add my-nvo vtep101032
sudo config vxlan map add vtep101032 100 500100
sudo config vxlan map add vtep101032 101 500101
2. Configure vxlan at HA

brctl addbr br_500100
brctl addif br_500100 vtep_500100
brctl stp br_500100 off
sudo ip link set vtep_500100 up
sudo ip link set br_500100 up
sudo ip addr add 100.0.0.3/24 dev br_500100
sudo ip addr add 100::3/24 dev br_500100
brctl addbr br_500101
brctl addif br_500101 vtep_500101
brctl stp br_500101 off
sudo ip link set vtep_500101 up
sudo ip link set br_500101 up
sudo ip addr add 101.0.0.2/24 dev br_500101
sudo ip addr add 101::2/64 dev br_500101
3. Configure IBGP at DUT and HA

!
router bgp 65000
bgp router-id 10.1.0.32
neighbor 30.0.0.2 remote-as 65000
neighbor 40.0.0.3 remote-as 65000
!
address-family ipv4 unicast
network 10.1.0.32/32
exit-address-family
!
address-family l2vpn evpn
neighbor 30.0.0.2 activate
neighbor 40.0.0.3 activate
advertise-all-vni
advertise-svi-ip
vni 500100
rd 10.1.0.32:100
exit-vni
vni 500101
rd 10.1.0.32:101
exit-vni
exit-address-family
!

!
router bgp 65000
bgp router-id 40.0.0.3
neighbor 40.0.0.1 remote-as 65000
!
address-family l2vpn evpn
neighbor 40.0.0.1 activate
advertise-all-vni
advertise-svi-ip
vni 500100
rd 40.0.0.3:100
exit-vni
exit-address-family
!

4. Check the vni vlan map relationship

show vxlan vlanvnimap
+----------+---------+
| VLAN | VNI |
+==========+=========+
| Vlan100 | 500100 |
+----------+---------+
| Vlan101 | 500101 |
+----------+---------+
Total count : 2

5. Check the vxlan tunnel by command "show vxlan tunnel", there is only one entry in the vni to vlan map part:

show vxlan tunnel
vxlan tunnel name source ip destination ip tunnel map name tunnel map mapping(vni -> vlan)

---

vtep101032 10.1.0.32 map_500100_Vlan100 500100 -> Vlan100

Describe the results you received:

Only one vlan-vni map entry - map_500100_Vlan100 500100 -> Vlan100

Describe the results you expected:

It should list all the vlan vni mapping entries

Output of show version:

(paste your output here)

Output of show techsupport:

(paste your output here or download and attach the file here )

Additional information you deem important (e.g. issue happens only occasionally):

There is the analysis result of developer:

The issue is due to the show command parsing code getting only the first vxlan map key and including it in the show command.

    vxlan_map_keys = config_db.keys(config_db.CONFIG_DB,
                                    'VXLAN_TUNNEL_MAP{}{}{}*'.format(config_db.KEY_SEPARATOR, vxlan_name, config_db.KEY_SEPARATOR))
    if vxlan_map_keys:
        vxlan_map_mapping = config_db.get_all(config_db.CONFIG_DB, vxlan_map_keys[0])
        r.append(vxlan_map_keys[0].split(config_db.KEY_SEPARATOR, 2)[2])
        r.append("{} -> {}".format(vxlan_map_mapping.get('vni'), vxlan_map_mapping.get('vlan')))
    table.append(r)

[zhangyanzhao]

BRCM will help to take a look. Thanks @adyeung

[skbhava]

Will work for the solution and create PR for review. ETA 09/19.

[adyeung]

Fix posted to
sonic-net/sonic-utilities#2391

[adyeung]

resolved by sonic-net/sonic-utilities#2391