IBM Ethernet Switch B48Y
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VLANs
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Up to 4096 maximum VLANs
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802.1Q tagging
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802.1Q-in-Q tagging
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Dual-mode VLANs (tagged and untagged traffic across same port)
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Port-based, protocol-based (AppleTalk, IPv4, IPv6, and IPX), and subnet-based VLANs
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GARP VLAN Registration Protocol (GVRP) for distributed VLAN configuration
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VLAN groups
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Private VLANs
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Link aggregation
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Up to eight links per group, 32 link groups per switch
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Static trunks compatible with Cisco EtherChannel
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802.3ad Link Aggregation Control Protocol (LACP) for dynamic trunk groups
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Cross-device link aggregation for switches in the same stack
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Quality of service and rate shaping
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Eight queues per port with strict priority (SP), weighted round robin (WRR), and combined
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SP/WRR schedulers
802.1p class of service (CoS)
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IP DSCP/DiffServ (type of service) to priority mapping
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ACL, port, and static MAC address to priority mapping
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Layer 2 CoS and Layer 3 DSCP re-marking
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Fixed and adaptive inbound rate limiting
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Outbound rate shaping
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Symmetric flow control supports 802.1x transmission and receipt of 802.1x PAUSE frames
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Layer 2
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Up to 32,000 MAC addresses.
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Per-VLAN Rapid Spanning Tree Protocol Plus (PVST/PVST+/PVRST+) compatibility in
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default configuration supports smooth implementation into Cisco Layer 2 environments.
802.1d Spanning Tree Protocol (STP).
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802.1w Rapid Spanning Tree Protocol (RSTP).
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802.1s Multiple Spanning Tree Protocol (MSTP) enables multiple STP instances and
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forwarding paths for more efficient traffic distribution.
Virtual Switch Redundancy Protocol (VSRP) is an alternative to STP and includes
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sub-second convergence and Layer 2 redundancy based on the VRRPE protocol.
Metro Ring Protocol (MRP) v1/v2 enables fast, sub-second convergence in ring topologies.
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IGMPv1/v2/v3, PIM-SM, and MLDv1/v2 Snooping reduces multicast flooding in a Layer 2
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network.
Root Guard prevents rogue devices from hijacking STP root.
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BPDU Guard prevents rogue devices from participating in STP.
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DHCP Assist helps DHCP servers respond correctly to devices in a different subnet than the
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DHCP server.