4200463
| Question | Answer |
| Management Server? | FFFFFA dynamically discovers topology of fabrics |
| Time server? | FFFFFB distributes time to all switches |
| Time Sync Server? | FFFFF6 Send sync signals to all switches |
| Security Server? | FFFFF7 Distributes Encryption Keys |
| Alias Server? | FFFFF8 Hunt groups and Multicast groups |
| Name Server? (Directory Server) | FFFFFC Lookup who is logged into the Fabric holds - Port iD, Type, Port Type, Symbolic port and node name. |
| Fabric Controller? | FFFFFD Handles RSCNs |
| Fabric Login Server? | FFFFFE Manages FLOGI and issues 24 bit addrs |
| Broadcast Server? | FFFFFF Broadcast to N and NL ports |
| FC-0 layer? | Physical I/F Hardware layer, seeds and feeds |
| FC-1layer? | Encode/decode 8b/10b and 64b/66b ordered sets and link control |
| FC2 layer? | Framing protocol/flow control 1. how to data into frames 2. how much to send in one go 3. when to send more - flow contr. 4. where frames will go 5. Class of Service |
| FC3 layer? | Common Fabric Services multicast and hunt groups |
| FC4 layer? | Upper Level Protocol IP, SCSI |
| Class of Service CoS 2 | connectionless, BtoB and EtoE credits acks to confirm del, no bw allocated no guarantee of delivery IP |
| Class of Service CoS 3? | connectionless, no acks B to B credits FCP |
| Class of Service (CoS) F | connectionless acks highest priority switch to switch comms |
| FC frame names of the primary fields? | SOF Header Payload CRC EOF |
| FC fame Max size? Max payload size? How many bytes in SOF, CRC, EOF? | Max size 2148 bytes Max Payload 2112 Header 24 bytes SOF, CRC, EOF each are 4 bytes |
| What are primitives? What do they do? | Used to signal events IDLE and ARB are examples Use to fill the space as FC tx all the time. Rx has to see min 3 of the same primitive to act on the signal. |
| nWWN length? fields? | node name 64 bits 1st 2 bytes vendor = 10:00 Broc 3 bytes OUI assigned by IEEE 3 bytes by Brocade - main board serial # |
| pWWN length? fields? | port name 64 bits 1st 2 bytes vendor = 2x:xx Broc x:xx are switch PORT number 3 bytes OUI assigned by IEEE 3 bytes by Brocade - main board serial # |
| display name server with type and rscn reg? | nsshow -rt (always use the options) 3 - full 2 - reg only for event detected by the Nxport 1 - reg for fabric events |
| nameserver cmds 1. local 2. fabric 3. 24 bit addrs in fabric | 1. nsshow -rt 2. nscamshow -t 3. nsallshow use 8 for FC and 5 for IP |
| FCP 24 bit network address structure? | Domain ID 8 bits Area ID 8 bits Node ID 8 bits (al_pa/NPIV/shared 00/80/C0) |
| Principal switch does what? | Determined by lowest pri if set then lowest wwn. Manages building fabrics ensuring unique domain IDs. Sync time across the switches. |
| Host login sequence? | FLOGI PLOGI SCR NS REG QUERY NS FOR DEVS |
| Device Login sequence? | PLOGI PRLI INQ |
| Fabric Initialisation Process when a switch joins a fabric? | ELP (exchange link params) ESC (exchange switch params) EFP (exchange Fabric params) |
| what is the number NPIV host that can log in? | default 126 check using portcfgshow |
| how to display the pwwns of NPIV connected hosts? | portshow x where x is the switchport shows HBA port with the hosts beneath it. switchshow will only give a count |
| what is FEC? which rel and port speeds? | Forward Error Correction 32 bit CRC can correct 11 bits in 2048 bytes enabled by default v7.0 in 10 and 16Gb |
| what are the 4 states of PSM for G_Port fabric connections? (Port State Machine) | Active - AC Link Reset - LR Offline - OLS Link Failure - LF |
| Nx_Port PSM power on sequence? | 1. NOS - non op. 2. OLS - offline 3. LR - link reset 4. LRR - link reset resp 5. AC - active 6. IDLE 7. IDLE |
| Nx_Port (PSM) from portDisable to portEnable? | 1. OLS 2. LR 3. LRR 4. AC |
| Condor2 ASIC spec? | Ports - E,F,FL,EX,M, with NPIV and FICON 40 ports (5 x 8 ports groups) 2048 BB creds per ASIC (8 res per port) SFP for 1,2,4 SFP+ 1,2,4,8 |
| BB credit check? | portbuffershow slot/port |
| GoldenEye2 spec? | Ports - E,F,FL,EX,M, with NPIV and FICON 32 ports (4 x 8 ports groups) 700 BB creds per ASIC (8 res per port) SFP for 1,2,4 SFP+ 1,2,4,8 |
| Condor3 spec? | Ports - E,F,EX,M, with NPIV and FICON No FL support 48 ports (6 x 8 ports groups) 8192 BB creds per ASIC (8 res per port) port speeds 2,4,8,10,16 layer 2 latency 800nS no FEC F to F layer 2 latency 1.2uS no FEC E to E |
| GoldenEye2 AISC use? | Used in Brocade standalone switches 300, 5300, 7800 |
| Condor2 ASIC use? | switches - 5100, DCX, DCX-4S, 8000, BES Blades - FC8-16, FC8-32, FC8-48, FC8-64 |
| Condor3 ASIC use? | switches - 6505,10,20, 7840, 8510,20 Blades - CR16-8, CR16-4, CR16-32, FC16-48, FC16-64 |
| Display blades in chassis? | slotshow -m for more detail use chassisshow |more |
| firmware version? | either - version or - firmwareshow to see all copies |
| how many VCs on an ISL? | 16 FC traffic defaults to VC2-5 |
| Brocade 300 spec? | 1u 24 port with 8 port POD lic 8G GoldenEye2 ASIC 676 BB credits per ASIC No Ex ports - no FC routing 1:1 sub ratio |
| Brocade 5100? | 1u 2 X psu 40 ports with 8 port POD lic Condor2 2012 BB credits per ASIC after 36 used internally. 1:1 sub ratio IR |
| Brocade 5300? | 1u 2 x PSU 3 x Fans 80 ports (10 x 8 port groups) 9 x GE2 ASICS 292 BB per ASIC (2628 total) or 32 per port IR |
| Brocade 6505 - Gen 5? | 1u 2 x PSU/fan assy 24 ports - 3 port groups of 8 1 x condor 3 1:1 sub ratio IR not supported Access Gateway capable 12 ports + 12 on POD lic |
| Brocade 6510? | 1u 2 x PSU/fan assy 48 ports - 6 port groups of 8 1 x condor 3 1:1 sub ratio IR with lic Access Gateway capable 12 ports + 12 on POD lic 7712 BB credits |
| Brocade 6520? | 2u 2 x PSU 3 x fan assy - beware of air direction 96 ports - 12 port groups of 8 1 x condor 3 1:1 sub ratio IR with lic Access Gateway capable 12 ports + 12 on POD lic 7712 BB credits Virtual Fabric support, up to four logical switches |
| Brocade 7800? (Access Gateway - AG) | Two configs: 4/2 - four 8Gb and two 1GbE ports 16/6 - sixteen 8Gb and six 1GbE ports 1 x GE2 Available as a bladed product - FX8-24 FC ports F,FL,E,EX GbE ports VE,VEX Combo ports either 2 x GbE Cu or 2 x GbE fibre but not both |
| How many port speeds do Brocade optics support? | All are tri-mode 16,8,4 8,4,2 4,2,1 except 10GB SFP+ & Quad 16Gb QSFP |
| what is the light frequency for SW and LW optics? cables used? | SW 850nm LW 1310nm SW - om1 62.5um om2,3,4 all 50um LW 9um |
| Which components are common to DCX and DCX 8510? | Chassis CP8 blades PSU Fans WWN cards Backplane |
| DCX CP & Core Blades? | CP8 and CR8 (CORE8) for DCX CP8 and CR4S-8 |
| DCX 8510 CP & Core Blades | CP8 and CR16 |
| Describe DCX ICL? Max number of DCX connected together with ICLs? | DCX 4 ICL ports over Cu 2 per CR8 blade 2 x 128Gb Max no. DCX conn is 3 in Full Mesh Distance only 2m DCX-4S 2 per CR8 blade but only 2 x 64Gb |
| Describe Gen 5 ICls found on 85xx? | Use Quad-QSFP on CR16-8 and CR16-4 Distance up to 100m Up to 6 chassis in Full Mesh |
| Gen 5 over-subscription ratios | FC16-32 1:1 FC16-48 1.5:1 FC8-48 2:1 |
| Display status of ICL links? | switchshow -slot x -qsfp |grep E-port |
| What are the default IP adds for DCX? | Mgt 10.77.77.77/24 CP0 10.77.77.75 CP1 10.77.77.74 ipaddrshow ipaddrset |
| How to set CLI timeout? | default is 10mins timeout cmd with x mins 0 to disable |
| cmd to change fabric params? | switchdisable configure and chose fabric make changes then switchenable |
| cmd to see date and time? cmd to set it? cmd to use NTP server? | date tsclockserver mmddhhmmyy tsclockserver <ntp ip addr> |
| set message of the day? set security banner? | motd --set bannerset "msg" |
| license cmds? | licenseidshow licenseshow licenseadd licenseremove licenseslotcfg |
| syslogd cmds? | syslogdipadd (depricated) syslogdipremove (depricated) syslogdipshow (depricated) syslogadmin (new) -set -ip |
| cmds to set fabric and port names? | fabricname --set <name> portname <index> -n <portname> |
| check fabric params? | configshow -pattern fabric.ops |
| configupload cmd options? | -vf virtual fabric -all the whole lot -fid specified logical switch -switch only in non VF mode -chassis only. |
| cmd to connect to VF | setcontext <FID> |
| Cmd to display trunks? Max number of links forming a trunk? what ensures IOD? | trunkshow switchshow 8 links max. ASIC polices IOD |
| Ports in Trunk must have which parameters the same? | speed distance QoS FEC Encrypt/Compr. trunk group trunking lic at both ends. |
| what happens when a trunk master goes offline? | It is transparent. One of the other links takes over. (Due to pseudo-trunking to prevent disruption as there is no fabric build) |
| How is the trunk master determined? Upon with ports can you set monitoring of a trunk? | It's the first ISL to come up. Only the trunk master can be monitored and it will move to the new master on failure. |
| what is the tool used to test trunks? | trunkdebug <start port> <end port> |
| What is the max cable length difference between ISLs which will form a trunk? | 400m |
| Exchange-based routing is also known as what? What is this routing is based on ? | DPS (Dynamic Path Selection) Based on the SID, DID and OXID and uses DLS (Dynamic Load Sharing). Every exchange can take a different path. |
| What is port based routing base upon? How long does the route remain in use? what does DLS do here? | Incoming port and the destination domain. Route is used until one of the devices goes offline or the fabric changes. DLS round-robins the I/P ports across the available O/P ports to balance the load. |
| What protocol is used for routing? Exchange-based routing or DPS handles multiple paths to a destination by doing what? | FSPF - Fabric Shortest Path First This is a form of spanning tree. It distributes the load across the // paths in proportion to the bandwidth available on each one - helps with IOD |
| cmd to display routing table when does a route cost change? | urouteshow Cost changes when another switch is inserted in the path, increasing the number of hops. |
| what does topologyshow give? | number of domains number of hops metrics path count |
| What info does pathinfo cmd give? Which routing method is it most useful for? | Destination port state forward and reverse paths link stats for every hop from source to dest link util for each hop from source to dest. Use for Port-based routing |
| trunking related cmds? | trunkshow trunkdebug switchshow ISLshow portcfgshow portcfgtrunkport |
| If you add a trunking lic to a switch. what do you need to get trunking working? | It should be enable on each port by default. But need to do one of the steps below: 1.either enable and disable the whole switch 2. or disable and enable the ports that will be used for trunking |
| Brocade Extended Fabrics is a licensed feature for distances over? what does it change on the switch? | 10km+ Allows more BB credits to be assigned and increases the switch buffers |
| Other than dark fibre what other connections are supported for long distance? | DWDM CWDM TDM Synchronous Optical Networks over OC3(155Mb) and OC12(622Mb) |
| What two methods are used for flow control over an ISL? What fill words are used with each one? | VC_RDY (virtual channel) default method. fill ARB R_RDY (Receiver ready) fill IDLE |
| How to change the fill word? How to change from VC_RDY to R_RDY? default deskew value for shortest ISL? | portcfgfillword portcfgislmode 15 deskew units = 150nS with 5nS/m 150/5 = 30m equivalent |
| What are the distance modes Lx and supported disances? | L0 -default mode 2m - 5km LE - 5-10km no lic. LD - Long Dynamic - BB credits are allocated on the distance measured. LS - Long Static - User defined distance. |
| When enabling portcfglongdistance why it it best to enable vc_translation_link_init as well? | It allows an extended link init sequence which avoids excessive resetting of ports on long links. |
| steps in troubleshooting long links? | Same for any E_port 1. config check both ends - portcfgshow 2. any 3rd party HW VC_RDY or R_RDY supported? supported fill words ARB/IDLE? do they handle BB credits or not? |
| Trunking over long distance. What are the requirements? | All the usual trunk settings to be same. Long distance mode must be the same. Long distance lic at both ends. ISL R_RDY must be disabled using portcfgislmode |
| When there is 3rd party kit running protection switching which long dist mode should be use and why? | When protection switching is used the link length can change massively. Therefore LS should be set with the max distance of the longer route. The switch will not see the change and link will starve. |
| Speed of light in FC? how log is a fulll size frame at 2Gb, 4, 8, 16? | 5nS/m 2km - 2Gb 1km - 4Gb 500m - 8Gb 250m - 16Gb |
| How many port buffers left? | portbuffershow |
| what are the commands in order to get zoning applied with CLI? | create alias - alicreate create zone - zonecreate add alias to zones - zoneadd create configuration file - cfgcreate add zones to cfg file enable configuration - cfgenable |
| what is the default zone and how is it used? | Default zone allows all ports to all ports. This is why you don't disable the running cfgfile as it will start using the default zone. check with defzone -show disable by defzone -noaccess |
| How to clear the zoning db entirely? | cfgdisable cfgclear cfgsave |
| Zoning: what is the defined configuration? | complete set of zoned objects |
| Zoning: What is Effective configuration? | This is the "live" running cfg which has been enabled by cfgenable |
| Zoning: What is Saved configuration? | There can be multiple saved cfgs. |
| Enabling Zoning; what are the steps? | 1. defined cfg is enabled this is the "live" zoning config. 2. defined cfg is written to flash 3. name of effective cfg is written into flash. |
| what does cfgsave do? | It writes the defined config to memory but does not enable it. It then writes the name of the effective cfg to flash mem as well. |
| what happens on a zone merge with default zones set differently? | Zone conflict - make the both allaccess or noaccess. |
| name the zoning segmentation reasons? (three) | 1.config mismatch: effective cfgs are not the same. 2.type mismatch: same name used for different objects. 3. content mismatch: order. |
| What are LSAN zones? How are they identified? | They span routed fabrics. Prefixed with "lsan_" |
| What is a TI zone | Traffic Isolation zone. Used to isolate traffic to a specif path. It does NOT control access - a normal zone is required as well. |
| Where can you see TI zones? how are the members defined? can ports be members of more than one TI zone? Do you need to include E_ports? | Only in the defined cfg not in effecive one. Only by D,I (domain & index) Ports can only be in a single TI zone. E and F ports are required to give an end-to-end path. |
| What do QoS zones do? what are the prefixes used for high and low? | enables setting of traffic priorities between specif hosts and targets. QOSH_ (high) QOSL_(low) |
| What are the generally used proportions of bandwidth for high, med & low? | High 60% Med 30% Low 10% less class F traffic. |
| When does the QoS come into play for a given link? When is medium QoS used? how are the members defined? | Only if there is contention. Medium is used when either their is no contention or when no QoS zones are specified. Using wwn only. |
| cmd to check zone db size? do the max sizes vary? | cfgsize yes by fw version. 7.4 2MB 5.2 - 7.xx = 1MB |
| What determines the kind of zoning enforcement used? | Frame based - either all wwn or D, I (most secure- dest ASIC checks SID on every frame against CAM table entries) Session based - mixed wwn & D,I (PLOGI restricted at the ASIC) |
| What happens to a device when it is in overlapping zones and one zone is frame based and one is session? | The enforcement for that device is reduced to session based. |
| cmd to show zone type? what does cfgenable do? | portzoneshow cfgenable - saves defined cfg writes the name to flash, distrubutes & save zoning cfg to all switches in the fabric. |
| what does nodefind do? | it displays all of the NS entries matcing the wwn, PID(hex) or alias. |
| what does nszonemember do? | shows all online devs that are zoned with a given dev by wwn or PID. |
| cmd to see zoned and unzoned devs. | nszonemember -u nszonemember -a |
| cmd to backup switch config with 1.no vf 2. vf 3.chassis only | configupload -all configupload -vf configupload -chassis |
| how to restore a vf config? | disable switch configdownload -vf configdownload -all reboot switch enable switch |
| show ha status? what firmware is in each partition? check progress of fw download? | hashow firmwareshow -v firmwaredownloadstatus |
| display contents of USB key? | usbstorage -l |
| cmd to set password policy? what does this do? | passwdcfg sets the rules relating to all new passwords. |
| DLS Dynamic load sharing recomputes the load sharing when what happens? | a switch joins the fabric an E_port goes on or offline an EX_port goes offline device goes offline. |
| What is FA-PWWN? | Fabric Assigned PWWN. This is a virtual port which is mapped to a real port. It allows zoning to be preconfiged. It simplifies HBA replacement since the new physical PWWN is masked from the fabric. |
| what do you need to use FA-PWWN? | Brocade HBA with v3.0.0 or later. |
| what does fcping do? | Checks two zoned devices can communicate. 1st ELS sent to SID and 2nd sent to DID. Use PID, nwwn or pwwn. |
| what is a bottleneck? how to test? | A port where the offered load is > the egress throughput. (congestion) latency bottleneck is where the dev at the other end is slow to rx the data. cmd bottleneckmon |
| what can cause segmented fabric? | domain ID conflicts, zoning conflicts, incompatible switch parameters, FID conflict(VF) security |
| what may cause a missing dev | NxPort not reg with NS dev missing from zoning LUN masking enabled on dev apllication accessing dev is not cfg correctly DCC security pol. |
| porterrshow: enc_in? | 8/10bit enc errs inside frames. corruption during enc. |
| porterrshow: crc_err | frames have bad CRC sfps or cable run porttest |
| porterrshow: crc_g_eof | contains CRC but has good EOF. this shows that the bad link is on this switch. when the frame gets passed on the g-eof will be cleared and just show as CRC. |
| porterrshow: too_short | txer or unreliable link |
| porterrshow: too long | frame >2148 bytes |
| porterrshow: bad_eof | can occur during loss and recovery of sync. too long and this can cause loss of BB credits. |
| porterrshow: enc_out | errors outside frames (ordered sets) sfp or cable, porttest. |
| what is superPing? | tests all routes between a source and destination switch: fcping --allpaths (PID/Domain/wwn) |
Want to create your own Flashcards for free with GoConqr? Learn more.