MLS Management Interface

When a RSM or router is configured to participate in MLS, the device uses the MLSP to send Hello messages, advertise routing changes, and announce the VLANs or MAC addresses of those interfaces on the devices participating in MLS. One interface on the MLS-RP must be identified as the management interface through which MLSP packets are sent and received. The MLSP management interface can be any MLS interface connected to the switch.

Only one management interface needs to be specified. If no management interface is configured, however, MLSP messages will not be sent.

Multiple interfaces on the same route processor can be configured as a management interface; however, this action increases the management overhead per route processor. Cisco does not recommend this practice.

To identify a management interface on an RSM or router, enter the following command in interface configuration mode:

Router(config-if)#mls rp management-interface

To disable the management interface, enter the no mls rp management-interface command in interface configuration mode.

The running configuration in Example 8-6 states that the VLAN41 interface on the MLS-RP is configured as the management interface.

Example 8-6 Determining if the MLS-RP VLAN Interface Is Configured as the Management Interface

The running configuration in Example 8-6 states that the VLAN41 interface on the MLS-RP is configured as the management interface.

Example 8-6 Determining if the MLS-RP VLAN Interface Is Configured as the Management Interface

Router#show run

Building configuration...

(Text Deleted)

mls rp ip !

interface Vlanl

ip address 172.16

1.168 255.255.255.0

interface Vlan41

ip address 172.16

41.168 255.255.255.0

mls rp vtp-domain

bcmsn

mls rp management

interface

mls rp ip

To verify the MLS configuration for an MLS-RP, enter the following command in privileged EXEC mode:

Router#show mls rp

The display resulting from this command (see Example 8-7) shows the following information:

• Whether MLS is globally enabled or disabled.

• The name of the VTP domain(s) in which the MLS-RP interfaces reside.

• Statistical information for each VTP domain.

• The number of management interfaces defined for the MLS-RP.

• The number of VLANs configured for MLS.

• The ID of each VLAN configured for this MAC address.

• The number of MLS-SEs to which the router or RSM is connected.

• The MAC address of each switch. Example 8-7 Displaying MLS RP Information

router# show mls rp

multilayer switching is globally enabled

mls id is 00e0.fefc.6000

mls ip address 10.20.26.64

mls flow mask is ip-flow

vlan domain name: WBU

current flow mask: ip-flow

current sequence number:

80709115

current/maximum retry count: 0/10

current domain state: no-

change

current/next global purge

: false/false

current/next purge count:

0/0

domain uptime: 13:03:19

keepalive timer expires in 9 seconds

retry timer not running

change timer not running

fcp subblock count = 7

1 management interface(s)

currently defined:

vlan 1 on Vlanl

7 mac-vlan(s) configured

for multi-layer switching:

mac 00e0.fefc.6000

vlan id(s)

1 10 91 92

93 95 100

router currently aware of

following 1 switch(es):

switch id 0010.1192.b5ff

Each MLSP-RP is identified to the switch by both the MLS ID and MLS IP address of the route processor. The MLS ID is the MAC address of the route processor. The MLS-RP automatically selects the IP address of one of its interfaces and uses that IP address as its MLS IP address.

The MLS-SE uses the MLS ID as a determining factor for establishing entries in the MLS cache.

This MLS IP address is used in the following situations:

• By the MLS-RP and the MLS-SE when sending MLS statistics to a data collection application.

• In the included MLS route processor list on the switch.

To verify the MLS configuration for a specific interface, enter the following command in privilege EXEC mode:

Router#show mls rp interface interface number

The display resulting from this command shows the following information:

• Whether MLS is configured on the interface.

• The VTP domain in which the VLAN ID resides.

• Whether this interface is configured as the management interface for the MLS-RP.

If the interface is not configured for MLS, the show mls rp ip command displays the following message:

Router#show mls rp ip interface Vlan41

mls not configured on Vlan41

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