Brocade Communications Systems 8/40 Manuale Utente

August 2009 © 2009 Brocade Communications Systems, Inc. 1Chapter 8Configuring IPOverview of Configuring IPThe Internet Protocol (IP) is enabled by de

10 © 2009 Brocade Communications Systems, Inc. August 2009Configuring IP ParametersSome parameters can be configured globally while others can be co

August 2009 © 2009 Brocade Communications Systems, Inc. 11Use the secondary parameter if you have already configured an IP address within the sam

12 © 2009 Brocade Communications Systems, Inc. August 2009For the syntax of the IP address, see “Assigning an IP Address to an Ethernet Port” on pag

August 2009 © 2009 Brocade Communications Systems, Inc. 13case, the packet is dropped if the DF (Do-Not-Fragment) bit is set in the original IP p

14 © 2009 Brocade Communications Systems, Inc. August 2009BigIron RX(config)# interface tunnel 1BigIron RX(config-tnif-1)tunnel mode gre ipSyntax: t

August 2009 © 2009 Brocade Communications Systems, Inc. 15Figure 8.3 GRE IP Tunnel Configuration ExampleConfiguration Example for BigIron RX ABig

16 © 2009 Brocade Communications Systems, Inc. August 2009This display shows the following information.The show ip route command displays routes tha

August 2009 © 2009 Brocade Communications Systems, Inc. 17 No port name MTU 1476 BytesSyntax: show interface tunnel <number>The <

18 © 2009 Brocade Communications Systems, Inc. August 2009BigIron RX(config-tnif-1)#tunnel destination 198.162.100.1BigIron RX(config-tnif-1)#tunnel

August 2009 © 2009 Brocade Communications Systems, Inc. 19This display shows the following information.Displaying Tunnel Interface InformationFor

2 © 2009 Brocade Communications Systems, Inc. August 20091. When the BigIron RX receives an IP packet, the BigIron RX checks for IP ACL filters on t

20 © 2009 Brocade Communications Systems, Inc. August 2009Displaying Interface Level IPv6 SettingsTo display Interface level IPv6 settings for tunne

August 2009 © 2009 Brocade Communications Systems, Inc. 21domain name, the BigIron RX automatically appends the appropriate domain to the host an

22 © 2009 Brocade Communications Systems, Inc. August 2009Verifying Domain Name or IP AddressYou can use the ip domain-lookup command to verify the

August 2009 © 2009 Brocade Communications Systems, Inc. 23<ip-address> Enter the IP address of the host. This must be the correct IP addres

24 © 2009 Brocade Communications Systems, Inc. August 2009Syntax: ip dns poll-interval <minutes>Enter the polling interval in minutes. The de

August 2009 © 2009 Brocade Communications Systems, Inc. 25After you enter the command, a message indicating that the DNS query is in process and

26 © 2009 Brocade Communications Systems, Inc. August 2009To change the IP encapsulation type on interface 1/5 to Ethernet SNAP, enter the following

August 2009 © 2009 Brocade Communications Systems, Inc. 27Changing the MTUThe IP MTU is the maximum length of an IP packet that a Layer 2 packet

28 © 2009 Brocade Communications Systems, Inc. August 2009BigIron RX(config)# int e 1/5BigIron RX(config-if-e10000-5)# ip mtu 1000Syntax: [no] ip mt

August 2009 © 2009 Brocade Communications Systems, Inc. 29RX to always use the lowest-numbered IP address on a specific interface as the source a

August 2009 © 2009 Brocade Communications Systems, Inc. 3To display ARP entries, see the following:• “Displaying the ARP Cache” on page 8-64 • “D

30 © 2009 Brocade Communications Systems, Inc. August 2009RADIUS PacketsTo specify the lowest-numbered IP address configured on a virtual interface

August 2009 © 2009 Brocade Communications Systems, Inc. 31Syntax: [no] ip ip-option-processIP Receive Access ListThe IP receive access list featu

32 © 2009 Brocade Communications Systems, Inc. August 2009table does not contain a route to the packet’s destination. In each case, the BigIron RX m

August 2009 © 2009 Brocade Communications Systems, Inc. 33The <num> parameter specifies the number of ARP packets and can be from 0 – 30,00

34 © 2009 Brocade Communications Systems, Inc. August 2009Syntax: show ip traffic arpClearing the Rate Limit for ARP PacketsTo clear the ARP port ra

August 2009 © 2009 Brocade Communications Systems, Inc. 35BigIron RX(config)# no ip proxy-arpSyntax: [no] ip proxy-arpCreating Static ARP Entries

36 © 2009 Brocade Communications Systems, Inc. August 2009As of IronWare release 02.4.00 the maximum number of static ARP entries is 16384 (default:

August 2009 © 2009 Brocade Communications Systems, Inc. 37The value parameter speocifies the amount of time before a nexthop down is replaced by

38 © 2009 Brocade Communications Systems, Inc. August 2009Enabling Forwarding of Directed BroadcastsA directed broadcast is an IP broadcast to all d

August 2009 © 2009 Brocade Communications Systems, Inc. 39Enabling Support for Zero-Based IP Subnet BroadcastsBy default, the BigIron RX treats I

4 © 2009 Brocade Communications Systems, Inc. August 2009IP Forwarding CacheThe BigIron RX maintains a software cache table for fast processing of I

40 © 2009 Brocade Communications Systems, Inc. August 2009• Network – The BigIron RX cannot reach the network specified in the destination IP addres

August 2009 © 2009 Brocade Communications Systems, Inc. 41NOTE: The device forwards misdirected traffic to the appropriate router, even if you di

42 © 2009 Brocade Communications Systems, Inc. August 2009another)• A “null” interface. The BigIron RX drops traffic forwarded to the null interface

August 2009 © 2009 Brocade Communications Systems, Inc. 43Figure 8.6 Example of a static routeThe following command configures a static route to

44 © 2009 Brocade Communications Systems, Inc. August 2009RX. If you specify an Ethernet port, the BigIron RX forwards packets destined for the stat

August 2009 © 2009 Brocade Communications Systems, Inc. 45Dropping Traffic Sent to the Null0 Interface In HardwareTraffic sent to the null0 inter

46 © 2009 Brocade Communications Systems, Inc. August 2009NOTE: You also can bias the BigIron RX to select one of the routes by configuring them wit

August 2009 © 2009 Brocade Communications Systems, Inc. 47Figure 8.7 Standard and null static routes to the same destination networkFigure 8.8 on

48 © 2009 Brocade Communications Systems, Inc. August 2009Figure 8.8 Standard and interface routes to the same destination networkTo configure a sta

August 2009 © 2009 Brocade Communications Systems, Inc. 49When the software uses the default network route, it also uses the default network rout

August 2009 © 2009 Brocade Communications Systems, Inc. 5IP Global Parameters Table 8.1 lists the IP global parameters for the BigIron RX, their

50 © 2009 Brocade Communications Systems, Inc. August 2009Configuring IP Load SharingThe IP route table can contain more than one path to a given de

August 2009 © 2009 Brocade Communications Systems, Inc. 51• Unknown – 255 (the router will not use this route)Lower administrative distances are

52 © 2009 Brocade Communications Systems, Inc. August 2009The load sharing state for all the route sources is based on the state of IP load sharing.

August 2009 © 2009 Brocade Communications Systems, Inc. 53Default Route ECMPOn the BigIron RX, IP load sharing (also known as ECMP load sharing)

54 © 2009 Brocade Communications Systems, Inc. August 2009IP Receive Access ListThe IP receive access list feature uses IPv4 ACLs to filter the pack

August 2009 © 2009 Brocade Communications Systems, Inc. 55• Packet type – The BigIron RX can send Router Advertisement messages as IP broadcasts

56 © 2009 Brocade Communications Systems, Inc. August 2009The minadvertinterval parameter specifies the minimum amount of time the BigIron RX can wa

August 2009 © 2009 Brocade Communications Systems, Inc. 57Enabling Forwarding for a UDP ApplicationIf you want the BigIron RX to forward client r

58 © 2009 Brocade Communications Systems, Inc. August 2009You can configure up to 16 helper addresses on each interface. You can configure a helper

August 2009 © 2009 Brocade Communications Systems, Inc. 59Configuring an IP Helper AddressThe procedure for configuring a helper address for Boot

6 © 2009 Brocade Communications Systems, Inc. August 2009ARP age The amount of time the device keeps a MAC address learned through ARP in the device

60 © 2009 Brocade Communications Systems, Inc. August 2009• IP traffic statistics – see “Displaying IP Traffic Statistics” on page 8-70.The sections

August 2009 © 2009 Brocade Communications Systems, Inc. 61This display shows the following information.Table 8.9: CLI Display of Global IP Config

62 © 2009 Brocade Communications Systems, Inc. August 2009Displaying IP Interface InformationTo display IP interface information, enter the followin

August 2009 © 2009 Brocade Communications Systems, Inc. 63This display shows the following information.To display detailed IP information for a s

64 © 2009 Brocade Communications Systems, Inc. August 2009When you display the messages in the Syslog, you see the interface name under the Dynamic

August 2009 © 2009 Brocade Communications Systems, Inc. 65NOTE: The entry numbers in the ARP cache are not related to the entry numbers for stati

66 © 2009 Brocade Communications Systems, Inc. August 2009For information on the command syntax, see the syntax of the show arp command under “Displ

August 2009 © 2009 Brocade Communications Systems, Inc. 67The show ip cache and show ip network commands entered on the rconsole display the foll

68 © 2009 Brocade Communications Systems, Inc. August 2009Displaying the IP Route TableTo display the IP route table, enter the following command at

August 2009 © 2009 Brocade Communications Systems, Inc. 69Here is an example of how to use the connected option. To display only the IP routes th

August 2009 © 2009 Brocade Communications Systems, Inc. 7ICMP Router Discovery Protocol (IRDP)An IP protocol a router can use to advertise the IP

70 © 2009 Brocade Communications Systems, Inc. August 2009In this example, the IP route table contains 35 entries. Of these entries, 6 are directly

August 2009 © 2009 Brocade Communications Systems, Inc. 71NOTE: In the BigIron RX, only those packets that are forwarded or generated by the CPU

72 © 2009 Brocade Communications Systems, Inc. August 2009bad header The number of IP packets dropped by the device due to a bad packet header.no ro

August 2009 © 2009 Brocade Communications Systems, Inc. 73received The number of UDP packets received by the device.sent The number of UDP packet

74 © 2009 Brocade Communications Systems, Inc. August 2009Displaying TCP Traffic StatisticsYou can use the show ip tcp traffic command to display TC

8 © 2009 Brocade Communications Systems, Inc. August 2009IP Interface ParametersTable 8.2 lists the interface-level IP parameters for the BigIron RX

August 2009 © 2009 Brocade Communications Systems, Inc. 9Metric A numeric cost the router adds to RIP routes learned on the interface. This para