UCB Switches Jean Walrand U C Berkeley www eecs berkeley edu wlr UCB Outline Switch Characteristics Examples Functions Output Buffer Input Buffer Virtual Output Buffer Shared Memory Modular UCB Switch Characteristics Ports Fast Ethernet OC 3 ATM Protocols ST Link Agg VLAN OSPF RIP BGP Performance Throughput 8 classes CoS UCB Examples Cisco 12416 The Cisco 12416 Internet router is a 10 Gigabit 16 slot chassis member of the Cisco 12000 series that provides a total switching capacity of 320 Gigabits per second Gbps with 20 Gbps 10 Gbps full duplex capacity per slot With its 16 slot chassis and extensive portfolio of line cards including the new Cisco 1 port OC 192c STM 64c and Cisco 4 port OC 48c STM 16c POS interfaces the Cisco 12416 Internet router supports high density ISP aggregation and pointof presence POP consolidation UCB Examples cont d Cisco 3600 Voice over Frame relay VoFR and Voice over ATM VoATM AALS on the digital voice interfaces T1 and E1 Gateways for the PBX and PSTN for IP telephony enabling applications like call transfers holds and conferencing UCB Examples cont d Extreme Networks Summit 48 10 100 ports 2 GE SX LX or LX 70 17 5Gbps non blocking 10 1 Mpps Wire speed L2 Wire speed L3 static or RIP OSPF DVRMP PIM UCB Examples cont d Foundry ServerIron Server Load Balancing Transparent Cache Switching Firewall Load Balancing Global Server Load Balancing Extended Layer 4 7 functionality including URL Cookie and SSL Session ID based switching Secure Network Address Translation NAT and Port address translation PAT UCB Functions Data Path and Control Path Note Figure from Prof Varaiya s notes for EE228b UCB Functions cont d Data Path Extract header Lookup forwarding rule Queuing decision drop mark queue Modify header Store packet Schedule transmission Send packet UCB Functions cont d Control Path Routing table IP MPLS ST Forwarding policies RED Policing Scheduling rules WFQ Priority UCB Functions cont d Timing Note Figure from Prof Varaiya s notes for EE228b UCB Functions cont d Table Lookup Example routing Note Figure from Prof Varaiya s notes for EE228b UCB Output Buffer Buffers at output ports Limitation Throughput rate of shared bus Note Figure from Prof Varaiya s notes for EE228b UCB Input Buffer Buffers at input ports Limitation Head of Line blocking Note Figure from Prof Varaiya s notes for EE228b UCB Virtual Output Buffer OUT buffers at each input port Complexity Matching Problem Note Figure from Prof Varaiya s notes for EE228b UCB Shared Buffer One memory pool shared by flows Limitation Memory Speed Note Figure from Prof Varaiya s notes for EE228b UCB Modular Switches Space Division Switching Blocking UCB Modular Switches Non Blocking cont d
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