Abstract. Avaya Solution & Interoperability Test Lab

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1 Avaya Solution & Interoperability Test Lab Configuring Link Resiliency Measures for the Avaya G700 Media Gateway using Extreme Networks Ethernet Automatic Protection Switching (EAPS) or Avaya Port Redundancy Issue 1.0 Abstract These Application Notes describes how to configure Extreme Networks Ethernet Automatic Protection Switching (EAPS) and the Port Redundancy feature used in Avaya Layer-2 devices. These redundancy measures were used to protect Avaya IP Telephony traffic by maintaining link integrity between the Extreme Networks Black Diamond series of switches and the Layer- 2 stack of an Avaya G700 or G350 Media Gateway, or an Avaya C363T-PWR PoE Switch. 1 of 9

2 1. Introduction Redundancy Option #1 is illustrated in Figure 1 with an Extreme Networks Black Diamond 6808 switch connected to an Avaya C363T-PWR PoE Switch using two 802.1q trunks. An EAPS ring is configured on the Extreme Networks Black Diamond 6808 to protect VoIP traffic traversing the redundant links. The EAPS configuration will disable the secondary link while the main link remains operational and will enable the secondary link whenever the primary link fails. Important Note: The firmware versions for the Avaya C363T-PWR and G700 Media Gateway validated in these Application Notes do not support EAPS protocol message exchanges as defined by Information RFC Instead, the Avaya devices are configured to passively transport EAPs messages between the BlackDiamond switch ports. The BlackDiamond identifies its own EAP messages being looped back to itself and controls the ring locally, protecting against looping conditions and providing high-speed redundant link failover. Redundancy Option #2 is also illustrated in Figure 1 with an Extreme Networks Black Diamond 6808 switch connected to an Avaya G700 Media Gateway using two 802.1q trunks. Connections on the Avaya G700 Media Gateway for the Extreme Networks Black Diamond 6808 switch are configured as redundant pairs using the Avaya Port Redundancy feature to protect VoIP traffic. If the primary link fails, the secondary link becomes established and continues forwarding traffic. This approach can be applied to either the Avaya G700 or G350 Media Gateway. Commands to create a redundant pair were also enabled on the Extreme Networks Black Diamond 6808 in Redundancy Option #2 to ensure synchronization of Layer-2 forwarding tables between it and the Avaya G700 Media Gateway. An Avaya C363T was used to provide a Layer- 2 switching platform outside of the domain enabled with port redundancy schemes. 2 of 9

3 Figure 1: Network Diagram 2. Equipment and Software Validated The following equipment and software were used for the sample configuration provided: Equipment Software Avaya C363T-PWR PoE Switch Avaya S8300 Media Server 2.2 Avaya G700 Media Gateway P330 L2: MGP: VoIP-v0: 40 Avaya 4620 IP Telephone 1.7 Extreme Networks Black Diamond 6808 ExtremeWare 7.2.0b25 3 of 9

4 3. Extreme Networks EAPS Overview The Ethernet Automatic Protection Switching (EAPS) technology by Extreme Networks was created to increase the availability and port resilience of Ethernet pairs. An EAPS Domain has a single "master node" for the Ethernet port designated as the primary port and uses transit nodes for all other Ethernet ports designated as secondary ports. EAPS uses a "control VLAN" that transmits a polling/alert mechanism to verify port redundancy and passes control information through all ports configured in the EAPS Domain. The master node blocks the secondary port for all non-control Ethernet frames belonging to the corresponding EAPS Domain, and if the master node detects a fault with the primary port, it unblocks the secondary port and allows data to pass through. 4. Configure Extreme Networks EAPS The following configuration steps for the Extreme Networks Black Diamond 6808 switch and Avaya G700 Media Gateway assume the devices are being administered from the factory default settings Configure Extreme Networks Black Diamond 6808 The following commands will create and configure an untagged VLAN on the port connected to the Avaya IP Telephone and tagged VLANs on the ports connected to the Avaya G700 Media Gateway. IP forwarding for inter-vlan traffic is also enabled. create vlan vlan40 create vlan vlan50 configure vlan vlan40 tag 40 configure vlan vlan50 tag 50 configure vlan vlan40 ipaddress configure vlan vlan50 ipaddress configure vlan vlan40 add port 6:5-6:6 tagged configure vlan vlan50 add port 6:5-6:6 tagged configure vlan vlan40 add port 8:25 untagged enable ipforwarding vlan vlan40 enable ipforwarding vlan vlan50 Create the EAPS control VLAN to be used by EAPS to send health-check traffic and assign a QoS profile of 8 to mark traffic from the control VLAN with the highest priority. Tag the control VLAN on the ports connected to the Avaya G700 Media Gateway. create vlan "vlan60" configure vlan "vlan60" qosprofile "QP8 configure vlan "vlan60" add port 6:5-6:6 tagged --Do not assign an IP address to the control vlan Globally enable the EAPS feature. Create an EAPS domain and designate the operation mode of the Black Diamond 6808 as the EAPS master node. Disable the spanning-tree protocol on ports assigned to VLANs protected in the EAPS domain. Configure the EAPS domain with a primary port and secondary port. 4 of 9

5 enable eaps create eaps "g700" configure eaps "g700" mode master configure stpd "s0" delete "vlan40" ports 6:5-6:6 configure stpd "s0" delete "vlan60" ports 6:5-6:6 configure eaps "g700" primary port 6:5 configure eaps "g700" secondary port 6:6 Assign the control VLAN to the EAPS Domain and protect the data-carrying VLANs on the ports connected to the Avaya G700 Media Gateway. Globally enable the EAPS function for the configured domain. configure eaps "g700" add control vlan "vlan60" configure eaps "g700" add protect vlan "vlan50" configure eaps "g700" add protect vlan "vlan40" enable eaps "g700" (Optional) Configure the timer value for health-check packets used by the master node for the minimum expiration of failtime before it unblocks the secondary port. configure eaps "g700" failtime 5 configure eaps "g700" hellotime Configure Avaya C363T-PWR PoE Switch Configure VLANs and set the connected ports to the designated native VLAN. Configure the trunking mode of the port to dot1q VLAN tagging and set the bind method used by VLANs assigned to the ports. set vlan 40 name vlan40 set vlan 50 name vlan50 set trunk 1/51-52 dot1q set port vlan 40 1/51-52 set port vlan-binding-mode 1/51-52 bind-to-configured 5. Avaya Port Redundancy Overview The Avaya G700 Port Redundancy feature can define two ports as a redundant pair to enhance the availability of Ethernet ports. A redundant pair consists of a primary port and a secondary port, with only one port being active at a time. During the normal operation of the redundancy pair, the primary port transmits and receives data, and the secondary port is disabled. If the primary port fails, the redundant pair performs a switchback and the secondary port becomes the active port. If the secondary port is the active port, there is no change back to the primary port until it recovers. Note: In order for the G700 Port Redundancy feature to perform, a port redundancy scheme must also be enabled on the Extreme Networks Black Diamond. In the event of port failure, ExtremeWare 7.2 software does not flush its Layer-2 forwarding cache which disables the port and causes data loss.. 5 of 9

6 6. Configure Avaya Port Redundancy The following configuration steps for the Avaya G700 Media Gateway and the Extreme Black Diamond 6808 assumes the device is being administered from the factory default settings Configure Avaya G700 Media Gateway Configure VLANs and set ports to the designated native VLAN connected to the Extreme Networks Black Diamond Configure the trunking mode of the ports to dot1q VLAN tagging and set the bind method used by VLANs assigned to the ports. set vlan 40 name vlan40 set vlan 50 name vlan50 set port vlan 40 1/1-2 set trunk 1/1-2 dot1q set port vlan-binding-mode 1/1-2 bind-to-configured Globally enable port redundancy on the Avaya G700 Media Gateway. Disable the spanning-tree protocol on the ports assigned as the redundant pair. set port redundancy enable set port spantree disable 1/1-2 Configure the primary and secondary ports to be defined in the port redundancy scheme. Give a unique label for identification and globally enable the defined redundancy scheme set port redundancy 1/2 1/1 on BlkDiamond set port redundancy enable BlkDiamond (Optional) Configure redundancy switchover timers on the Avaya G700 Media Gateway for the frequency of health-check packets and the switchback-interval for the minimum expiration of failure before it unblocks the secondary port. set port redundancy-intervals Configure Black Diamond Create VLANs configured with IP addressing and tag the ports connected to the Avaya G700 Media Gateway. Enable IP forwarding for the configured VLANs. create vlan vlan40 create vlan vlan50 configure vlan vlan40 tag 40 configure vlan vlan50 tag 50 configure vlan vlan40 ipaddress configure vlan vlan50 ipaddress configure vlan vlan40 add port 8:5-8:6 tagged configure vlan vlan50 add port 8:5-8:6 tagged enable ipforwarding vlan vlan40 enable ipforwarding vlan vlan50 Disable the spanning-tree protocol for VLANs configured on the ports assigned for redundancy. 6 of 9

7 Configure a secondary port to back up the specified primary port to create a redundancy pair. configure stpd "s0" delete "vlan40" ports 8:5-8:6 configure stpd "s0" delete "vlan50" ports 8:5-8:6 configure ports 6:5 redundant 6:6 7. Verification Steps This section will verify that the proper configuration steps have been applied EAPS Verification 1. Verify basic network connectivity for directly connected components and ensure IP routing. 2. Pull primary link and verify EAPS on the Extreme Networks Black Diamond Use the show eaps command to confirm EAPS is globally enabled and the secondary port is unblocked when the primary port is disconnected. EAPS Enabled: Yes Number of EAPS instances: 1 EAPSD-Bridge links: 3 Name: "p330" (instance=0) State: Completed [Running: Yes] Enabled: Yes Mode: Master Primary port: 6:5 Port status: Down Tag status: Tagged Secondary port: 6:6 Port status: Up Tag status: Tagged Hello Timer interval: 1 sec Fail Timer interval: 3 sec Fail timer expiry action: Send alert Last update: From Master Id 00:01:30:FF:31:F0, at Fri Jan 28 09:55: EAPS Domain has following Controller Vlan: Vlan Name VID QosProfile "vlan60" 0060 QP8 Number of Protected Vlans: Avaya G700 Media Gateway 1. Verify basic network connectivity for directly connected components and ensure IP routing. 2. Pull primary link and verify port redundancy on the Avaya G700 Media Gateway. 3. Use the show port redundancy command to confirm the port redundancy scheme is enabled and the secondary port is for forwarding traffic when the primary port is disconnected P330-1(configure)# show port redundancy Redundancy Name Primary Port Secondary Port Status BlkDiamond 1/1 1/2 secondary 8. Additional References Please refer to the following documents on detailed configurations: Sample Avaya G700 Media Gateway Controlled by Avaya S8300 Media Server Configuration Issue of 9

8 RFC 3619: Extreme Networks Ethernet Automatic Protection Switching (EAPS) v Conclusion As depicted by these Application Notes, the Extreme Networks Ethernet Automatic Protection Switching (EAPS) and the Avaya Port Redundancy features provided sufficient port redundancy and were able to maintain link resiliency. IP Telephone calls experienced a brief interruption during convergence when the primary link deactivated with EAPS and Avaya Port Redundancy. Although the Avaya G700 can provide a link resiliency measure, the Extreme Networks EAPS offers a more simplistic redundancy solution for Avaya IP Telephony with regard to ease of configuration and robustness. 8 of 9

9 Avaya and the Avaya Logo are trademarks of Avaya Inc. All trademarks identified by and are registered trademarks or trademarks, respectively, of Avaya Inc. All other trademarks are the property of their respective owners. The information provided in these Application Notes is subject to change without notice. The configurations, technical data, and recommendations provided in these Application Notes are believed to be accurate and dependable, but are presented without express or implied warranty. Users are responsible for their application of any products specified in these Application Notes. Please any questions or comments pertaining to these Application Notes along with the full title name and filename, located in the lower right corner, directly to the Avaya Solution & Interoperability Test Lab at 9 of 9