The below commands show the various VLAN's used in the fabric and the mapping between VLAN's
VLAN's allocated to Bridge Domain (BD) and End Point Group (EPG) can be seen using 'show vlan'. esx_bd2 and esx_epg2 are used as examples in this document.
leaf101# show vlan
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
13 -- active Eth1/1, Eth1/3
16 aci-demo:aci-demo-bd active Eth1/7
17 aci-demo:aci-demo-applicatoin active Eth1/7
:aci-demo-db
18 aci-demo:aci-demo-applicatoin active Eth1/7
:aci-demo-app
28 poaniker:esx_bd2 active Eth1/25--------------28 is the BD vlan for esx_bd2 in tenant poaniker
29 poaniker:esx_vmm:esx_epg2 active Eth1/25-----------29 is the FD vlan for esx_epg2 in tenant poaniker
VLAN Type Vlan-mode
---- ----- ----------
13 enet CE
16 enet CE
17 enet CE
18 enet CE
28 enet CE
29 enet CE
leaf101#
The mappings between the access encap and internal VLAN for EPG and EPG to BD VLAN can be obtained by connecting to the module using vsh_lc
leaf101# vsh_lc
dns: l3vm_api_init failed
dns: l3vm_api_init failed
module-1# show system internal eltmc info vlan brief
VLAN-Info
VlanId HW_VlanId Type Access_enc Access_enc Fabric_enc Fabric_enc BDVlan
Type Type
==================================================================================
13 19 BD_CTRL_VLAN 802.1q 4093 VXLAN 16777209 0
16 22 BD_VLAN Unknown 0 VXLAN 16547722 16
17 23 FD_VLAN 802.1q 301 VXLAN 8193 16
18 24 FD_VLAN 802.1q 300 VXLAN 8192 16
28 20 BD_VLAN Unknown 0 VXLAN 15695748 28
29 21 FD_VLAN 802.1q 315 VXLAN 8207 28
module-1#
The highlighted text corresponds to the example used in the output of 'show vlan'. The signifcance of each vlan is as follows:
315 is EPG encap vlan, used by the end host to send traffic
29 is the FD/internal vlan for EPG,should be same as seen in the 'show vlan' output. Each access_enc vlan has a FD_VLAN.
21 is the HW VLAN for the EPG, can also be checked in BCM HW
28 is the BD vlan associated to the FD vlan 29. If the BD has a subnet associated to it, the SVI for the BD corresponds to the BD VLAN. In this example, the SVI is interface vlan28 The end host default gateway is the IP address of interface vlan 28.
leaf101# show interface vlan 28
Vlan28 is up, line protocol is up
Hardware EtherSVI, address is 0022.bdf8.19ff
Internet Address is 30.1.1.1/24
MTU 9000 bytes, BW 10000000 Kbit, DLY 1 usec
reliability 255/255, txload 1/255, rxload 1/255
Carrier delay is 10 sec
Encapsulation ARPA, loopback not set
Keepalive not supported
ARP type: ARPA
Last clearing of "show interface" counters never
30 seconds input rate 0 bits/sec, 0 packets/sec
30 seconds output rate 0 bits/sec, 0 packets/sec
Load-Interval #2: 5 minute (300 seconds)
input rate 0 bps, 0 pps; output rate 0 bps, 0 pps
L3 Switched:
input: 0 pkts, 0 bytes - output: 0 pkts, 0 bytes
L3 in Switched:
ucast: 0 pkts, 0 bytes - mcast: 0 pkts, 0 bytes
L3 out Switched:
ucast: 0 pkts, 0 bytes - mcast: 0 pkts, 0 bytes
leaf101#
Checking VLAN translation in BCM shell
leaf101# vsh_lc
dns: l3vm_api_init failed
dns: l3vm_api_init failed
module-1# bcm-shell
NUM ARGS: 0
bcm shell path: /lc/isan/bin/bcm-shell-hw
unit is 0
Available Unit Numbers: 0
bcm-shell.0>
bcm-shell.0> search vlan_xlate old_vlan_id=0x13B------convert access_enc vlan to hex, 315 in hex is 13B
Searching VLAN_XLATE table indexes 0x0 through 0x3fff...
Relevant output shown below:
OLD_VLAN_ID=0x13b,XLATE:NEW_VLAN_ID=0x15
VLAN_ID=0x13b = 315 in decimal
XLATE:NEW_VLAN_ID=0x15 =21 in decimal, which is the same as the HW VLAN in the output of 'show vlan'
