Brocade MLX Series and Brocade NetIron XMR Diagnostic Guide ...

4VSRPMay 17 11:06:35 VSRP: Packet received on port 1/6, vlan VLAN: 100ver:2 type:1 vrid:1 pri:111 #ip:1 aut:0adv:1 dea:3 hld:3 ttl:2 scl:10 chksum:0xa93c 102.53.5.1May 17 11:06:42 VSRP: VLAN VLAN:100, VRID 1, State MASTER-CONFIRMMay 17 11:06:42 VSRP: vlan VLAN:10, VRID 10, state MASTERver:2 type:1 vrid:10 pri:110 #ip:1 aut:0adv:1 dea:3 hld:3 ttl:2 scl:10 chksum:0xaa3c 102.53.5.1ver:2 type:1 vrid:10 pri:110 #ip:1 aut:0adv:1 dea:3 hld:3 ttl:3 scl:10 chksum:0xaa3c 192.52.5.1May 17 11:07:04 VSRP: vlan VLAN:100, VRID 1 - send ARP requrest for ip 192.53.5.1ver:2 type:1 vrid:10 pri:110 #ip aut:0Configuration notes• The delay-link-event command delays the sending of port up or down events to Layer 2protocols. If VSRP is enabled on the port, the ownership will not change until the port statushas remained up or down for the configured amount of time to ensure that minor transientstates of a link do not unintentionally cause a disruptive topology change in the network.• To provide Layer 3 redundancy only, disable VSRP and use VRRP-E.• When you configure VSRP, make sure each non-VSRP Brocade device has a separate link toeach of the VSRP devices.Common diagnostic scenarios• Layer 2 VSRP packets may be mislabeled and have incorrect checksums.This occurs because Brocade uses the same packet format for Layer 2 VSRP and Layer 3 VSRPfor consistency. The Layer 3 and Layer 4 fields in the packet are not used as they do not haveany relevance in Layer 2 forwarding and processing. When a Layer 2 VSRP packet is receivedby the Brocade switch, it is parsed, interpreted as a VSRP packet, and processed. The Layer 2VSRP packet is not a routed IP packet. It is a Layer 2 switched packet using an ether-type of0x800 (IP). No router can route this packet, as the destination MAC of Layer 2 VSRP does notbelong to any router's MAC address. So this packet only has relevance within the VLAN.• VSRP may not work correctly if the host route table is not pointing to the correct defaultgateway.• When VSRP is configured on a Brocade NetIron XMR router, it does not advertise the virtualMAC to the attached Layer 2 switch, and the default gateway (VSRP VRID IP-Address) is notreachable.• A Layer 2 hitless upgrade causes MRP and VSRP ports to flap.VSRP was formerly not supported for hitless software upgrades. The MRP port state change logmessages are normal and are generated by the new active management module, which nowdefines the roles of each port. This issue occurs because of old software.102 Brocade MLX Series and Brocade NetIron XMR Diagnostic Guide53-1002426-02