Customer Environment

Symptoms

Root Cause

Troubleshooting Steps

Configuring VRRP-E on the MCT Client VLAN

Purpose

This section explains how to configure VRRP-E on the same client VLAN already used in the MCT topology.

VRRP-E provides a virtual gateway IP address for hosts connected to VLAN. This allows the hosts to use a single default gateway address while Peer-A and Peer-B provide redundancy for the gateway function. VRRP-E is a RUCKUS enhanced version of VRRP where all routers start as backup, the router with the highest active priority becomes master, and the master replies to ARP and ICMP requests for the virtual IP.

NOTE : MCT configuration is on the Following KB: 000015488

1. Existing VLAN and VE Reference and Topology used

Topology Information:

Client VLAN: VLAN 10

Client VE Interface: VE 10

 LAG 21: Client-facing LAG connecting the MCT peer switches to Client-A.

  LAG 2: Inter-Chassis Link (ICL) between the two MCT peer switches.

• Peer A: ICX 7850-48F

Peer-A#show running-config interface ve 10

interface ve 10

 ip address 192.168.10.2 255.255.255.0

Peer-A#show running-config vlan 10

vlan 10 name MCT-CLIENT-VLAN by port

 tagged lag 2 lag 21

• Peer B: ICX 7850-48F

Peer-A#show running-config interface ve 10

interface ve 10

 ip address 192.168.10.1 255.255.255.0

Peer-B#show running-config vlan 10

vlan 10 name MCT-CLIENT-VLAN by port

 tagged lag 2 lag 21

• Client A: ICX 7550-24P

Client-A#show running-config interface ve 10

interface ve 10

 ip address 192.168.10.10 255.255.255.0

Client-A#show running-config vlan 10

vlan 10 name MCT-CLIENT-VLAN by port

 tagged lag 21

• Firmware Version (all devices): 10.0.10g_cd6

2. VRRP-E Design Notes Before Configuration on this scenario

• Before configuring VRRP-E, validate the following:
• VLAN 10 must already exist on both MCT peers.
• VE 10 must already be configured on both MCT peers.
• The VRRP-E virtual IP must be in the same subnet as the VE 10 real IP addresses.
• The VRRP-E virtual IP must not be the same as any real interface IP address.
• Both peers must use the same VRID for the same VRRP-E instance. states that VRRP-E virtual router IDs can range from 1 to 255.
• The peer with the highest active VRRP-E priority becomes the master.
• VRRP-E is not supported on non-RUCKUS devices and does not interoperate with standards-based VRRP sessions.
• The peer with the higher priority should become the preferred master.
• The peer with the lower priority should remain as backup and take over only if the master is no longer available.

3. VRRP-E Configuration

3.1 Peer-A Configuration

Peer-A will be configured as the backup of VRRP-E master by assigning a lower priority.

To enable VRRP-extended

Peer-A(config)#router vrrp-extended

Peer-A(config-vrrpe-router)#exit

Peer-A(config)#interface ve 10

backup priPeer-A(config-vif-10)#ip vrrp-extended vrid 10

Peer-A(config-vif-10-vrid-10)#backup priority 100 track-priority 10

Peer-A(config-vif-10-vrid-10)#ip-address 192.168.10.254

Peer-A(config-vif-10-vrid-10)#advertise backup

Peer-A(config-vif-10-vrid-10)#activate

VRRPE router 10 for this interface is activating

Explanation:Peer-A uses priority 100, so Peer-B should remain in the backup state while Peer-A is operating as master. The backup role means Peer-B is standing by for the same virtual gateway IP. If Peer-A loses the master role or becomes unavailable, Peer-B can transition from backup to master and continue providing the same default gateway IP to the client VLAN.

The advertise backup command allows Peer-B to advertise its backup availability to the master router. This is useful because the master can see the backup router availability in the VRRP-E instance without requiring the engineer to log into the backup router

3.2 Peer-B Configuration

Peer-B will be configured as the preferred VRRP-E master by assigning a higher priority.

To enable VRRP-extended

Peer-B(config)#router vrrp-extended

Peer-B(config-vrrpe-router)#exit

Peer-B(config)#interface ve 10

 vrid 1Peer-B(config-vif-10)#ip vrrp-extended vrid 10

Peer-B(config-vif-10-vrid-10)#backup priority 105 track-priority 10

Peer-B(config-vif-10-vrid-10)#ip-address 192.168.10.254

Peer-B(config-vif-10-vrid-10)#activate

VRRPE router 10 for this interface is activating

Explanation:

Peer-B uses priority 105, which makes this peer the preferred master for VRRP-E instance 10. As long as Peer-B remains available and its active priority is higher than Peer-B.

4. Verification Commands for validation:

show ip vrrp-extended brief

show ip vrrp-extended ve 10

show ip vrrp-extended stat

Peer-A

Peer-B

Client-A Default Gateway

Client-A should use the VRRP-E virtual IP as the default gateway.

If a default route is needed on Client-A for testing:

Client-A(config)#ip route 0.0.0.0/0 192.168.10.254

Explanation:
The client should point to the VRRP-E virtual IP instead of the real VE IP address from Peer-A or Peer-B. This keeps the gateway consistent even if the VRRP-E master changes.

Resolution

Note: The configuration and reference commands are attached for your review.

Attachment 1

Attachment 2

Attachment 3