Virtual interswitch trunk (vIST)
Creating a Virtual IST
Use this procedure to create a virtual IST (vIST).
vIST creates a virtualized channel through the SPBM cloud, and this channel connects two SMLT devices to form a virtualized Switch Cluster. Note that the SPBM cloud can consist of as few as two nodes.
Important
-
When you create a vIST, VLANs assigned to SMLT ports must have an I-SID assigned.
-
If you assign a VLAN to an I-SID on one SMLT-BEB node, then you must create the same VLAN and assign it to the same I-SID on the peer SMLT-BEB node even if no devices are connected to this second node.
-
The vIST VLAN must also be associated with an I-SID. You can use the same vIST VLAN in another part of your network, but the I-SID associated with the vIST VLAN must not be used anywhere else.
Note
Simplified Virtual-IST (vIST) is for non-SPB customers who use SMLT with legacy IST. Simplified VIST is available for legacy multicast deployments only when the boot flag (spbm-config-mode) is disabled.
For more information, see Configuring Simplified vIST in SMLT topologies .
About this task
The following list provides an overview of the configuration steps:
Enable SPBM and IS-IS globally.
Configure SPBM and IS-IS.
Configure an Layer 2 VSN by assigning an I-SID to the C-VLAN, which is used by the vIST.
For information about SPBM and IS-IS, see SPBM and IS-IS Infrastructure Fundamentals.
Important
Do not change the system MTU to less than the default value of 1950 bytes. The system MTU must be 1950 or jumbo because of the header size increase when transmitting packets over the SPBM cloud.
Procedure
Example
The configuration example contains annotations (in parenthesis) to explain the configuration information.
Note
This configuration example is for vIST peer B.
#
# ISIS SPBM CONFIGURATION
#
router isis
spbm 1
spbm 1 nick-name 0.00.16
spbm 1 b-vid 10,20 primary 10
spbm 1 smlt-virtual-bmac 00:00:84:04:01:01
spbm 1 smlt-peer-system-id a051.c6eb.c865
exit
#
# MLT CONFIGURATION
#
mlt 1 enable
mlt 1 member 1/28
mlt 2 enable
mlt 2 member 1/10
mlt 2 encapsulation dot1q
#
# VLAN CONFIGURATION
#
vlan members remove 1 1/28,1/10
(The rest of this VLAN section are all prerequisites for configuring a vIST.)
vlan create 10 type spbm-bvlan (This command and the next create the B-VLANs.)
vlan create 20 type spbm-bvlan
vlan create 33 type port-mstprstp 0
vlan i-sid 33 33
mlt 1 vlan 33
vlan create 100 type port-mstprstp 0 (Creates the C-VLAN for the vIST VLAN.)
vlan i-sid 100 100 (Creates a Layer 2 VSN for the vIST VLAN.)
interface Vlan 100
ip address 192.0.2.2 255.255.255.0 0 (Assigns an IP to the vIST VLAN.)
exit
#
# VIRTUAL vIST CONFIGURATION
#
virtual-ist peer-ip 192.0.2.1 vlan 100 (vIST configuration.)
#
# MLT INTERFACE CONFIGURATION
#
interface mlt 1
smlt
exit
interface mlt 2
isis
isis spbm 1
isis enable
exit
#
# PORT CONFIGURATION - PHASE II
#
interface GigabitEthernet 1/28
no shutdown
no spanning-tree mstp force-port-state enable
exit
interface GigabitEthernet 1/10
no shutdown
exit
#
# ISIS CONFIGURATION
#
router isis
is-type l1
manual-area 11.1111
exit
router isis enable
Variable definitions
Use the data in the following table to use the ist peer-ip command.
|
Variable |
Value |
|---|---|
|
<A.B.C.D> |
Specifies the peer IP address—the IP address of the vIST VLAN on the other aggregation switch. |
|
<1-4059> |
Specifies the VLAN ID for this vIST. |
Viewing vIST Statistics
View virtual IST (vIST) statistics for the switch.
Procedure
Example
Switch:1#show virtual-ist stat
================================================================================
IST Message Statistics
================================================================================
PROTOCOL MESSAGE COUNT
--------------------------------------------------------------------------------
Ist Down : 0
Hello Sent : 0
Hello Recv : 0
Learn MAC Address Sent : 0
Learn MAC Address Recv : 0
MAC Address AgeOut Sent : 0
MAC Address AgeOut Recv : 0
MAC Address Expired Sent : 0
MAC Address Expired Sent : 0
Delete Mac Address Sent : 0
Delete Mac Address Recv : 0
Smlt Down Sent : 0
Smlt Down Recv : 0
Smlt Up Sent : 0
Smlt Up Recv : 0
Send MAC Address Sent : 0
Send MAC Address Recv : 0
IGMP Sent : 0
IGMP Recv : 0
Port Down Sent : 0
Port Down Recv : 0
Request MAC Table Sent : 0
Request MAC Table Recv : 0
Unknown Msg Type Recv : 0
Mlt Table Sync Req Sent : 0
Mlt Table Sync Req Recv : 0
Mlt Table Sync Sent : 0
Mlt Table Sync Recv : 0
Port Update Sent : 0
Port Update Recv : 0
Entry Update Sent : 0
Entry Update Recv : 0
Dialect Negotiate Sent : 0
Dialect Negotiate Recv : 0
Update Response Sent : 0
Update Response Recv : 0
Transaction Que HiWaterM : 0
Poll Count Hi Water Mark : 0
Editing a virtual IST
If you need to change the virtual IST (vIST) peer-ip or vlan, use this procedure to delete the vIST first.
Note
-
You must disable IS-IS globally before deleting a vIST, and then re-enable it after creating a new vIST.
-
You do not have to set the SMLT peer system ID or the virtual B-MAC to 0 before you change the vIST peer IP address or VLAN ID number.
Procedure
Configuring Simplified vIST in SMLT topologies
This procedure shows how to configure Simplified vIST in an SMLT environment. It includes steps to configure the following:
Setting the boot config flag
Configuring the vIST peer
Enabling Simplified vIST
Important
When you enable Simplified vIST with the virtual-ist enable command, two VLANs are automatically created to support vIST. The VLAN IDs are: 4086 and 4087.
Before you begin
-
SPBM must not be enabled on the vIST peers.
-
Disable PIM Infinite Threshold Policy.
About this task
Important
Do not change the system MTU to less than the default value of 1950 bytes. The system MTU must be 1950 or jumbo because of a header size increase.
Procedure
-
Save the configuration, and then
reboot the switch.
Important
Any change to the spbm-config-mode boot flag requires a reboot for the change to take effect.
-
Configure the vIST MLT:
mlt <1-512> enable
mlt <1-512> member {slot/port[/sub-port] [-slot/port[/sub-port]] [,...]}
mlt <1-512> encapsulation dot1q
interface mlt <1-512>
virtual-ist enable
Note
The virtual-ist enable command enables Simplified vIST and is only available when the spbm-config-mode boot flag is disabled.
Example
enable configure terminal no boot config flags spbm-config-mode
Save the configuration and reboot the switch.
virtual-ist peer-ip 192.0.2.1 vlan 50 mlt 3 enable mlt 3 member 1/35,1/36 interface mlt 3 smlt exit mlt 5 enable mlt 5 member 2/15,2/17 mlt 5 encapsulation dot1q interface mlt 5 virtual-ist enable exit vlan create 50 type port-mstprstp 0 interface vlan 50 ip address 192.0.2.2 255.255.255.0 1 exit vlan create 100 vlan mlt 100 3 interface vlan 100 ip address 198.51.100.1 255.255.255.0 2 exit