HP 5500 Ei 5500 Si Switch Series Configuration Guide
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99 Concepts Preference of an IP address Every IP address advertised in RAs has a preference value. The IP address with the highest preference is selected as the default router address. You can configure the preference for IP addresses advertised on a router interface. The bigger the preference value, the higher the preference. The minimum preference value (-2147483648) is used to indicate that the address, even though it may be advertised, is not to be used by neighboring hosts as a default...
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100 Step Command Remarks 2. Enter interface view. interface interface-type interface-number The interface can be a Layer 3 Ethernet port or VLAN interface. 3. Enable IRDP on the interface. ip irdp Disabled by default. 4. Configure the preference of advertised IP addresses. ip irdp preference preference-value Optional. The preference defaults to 0. The specified preference applies to all advertised IP addresses, including the primary IP address and the manually configured...
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101 Figure 48 Network diagram Configuration procedure 1. Configure Switch A: # Specify the IP address fo r VLAN-interface 100. system-view [SwitchA] interface Vlan-interface 100 [SwitchA-Vlan-interface100] ip address 10.154.5.1 24 # Enable IRDP on VLAN-interface 100. [SwitchA-Vlan-interface100] ip irdp # Specify preference 1000 for the IP address of VLAN-interface 100. [SwitchA-Vlan-interface100] ip irdp preference 1000 # Configure the multicast address 224.0.0.1 as the destination IP...
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102 Verifying the configuration After enabling IRDP on Host A and Host B, display the routing table for the hosts (Host A for example). [HostA@localhost ~]$ netstat -rne Kernel IP routing table Destination Gateway Genmask Flags Metric Ref Use \ Iface 10.154.5.0 0.0.0.0 255.255.255.0 U 0 0 0 \ eth1 192.168.1.0 0.0.0.0 255.255.255.0 U 0 0 0 \ eth1 192.168.2.0 0.0.0.0 255.255.255.0 U 0 0...
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103 Configuring IP performance optimization O n ly t h e H P 550 0 E I swi tch s e rie s s u p p o r ts c o n fig u ri ng I P p e r fo rm a n c e o p t i m iza t io n o n Laye r 3 E t h e rn e t interfaces. The term interface in this chapter refers to Layer 3 interfaces, including VLAN interfaces and route-mode (or Layer 3) Ethernet ports. You can set an Ethernet port to operate in route mode by using the port link-mode route command (see Layer 2—LAN Switching Configuration...
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104 Step Command Remarks 1. Enter system view. system-view N/A 2. Enter interface view. interface interface-type interface-number N/A 3. Enable the interface to forward directed broadcasts. ip forward-broadcast [ acl acl-number ] Disabled by default Configuration example Network requirements As shown in Figure 49 , the host’s interface and VLAN-interface 3 of the switch are on the same network s e g m e n t ( 1.1.1. 0 / 2 4 ) . V L A N - i n t e r f a c e 2 o f S w i t c h...
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105 1. A TCP source device sends a packet with the Don’t Fragment (DF) bit set. 2. A router that fails to forward the packet becaus e it exceeds the MTU on the outgoing interface discards the packet and returns an ICMP error message, which contains the MTU of the outgoing interface. 3. Upon receiving the ICMP message, the TCP source device calculates the current path MTU of the TCP connection. 4. The TCP source device sends subsequent TCP segm ents that each are smaller than the MSS...
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106 • synwait timer —When sending a SYN packet, TCP starts the synwait timer. If no response packet is received within the synwait timer interval, the TCP connection cannot be created. • finwait timer —When a TCP connection is changed into FIN_WAIT_2 state, the finwait timer is started. If no FIN packet is received within the ti mer interval, the TCP connection is terminated. If a FIN packet is received, the TCP connection state changes to TIME_WAIT. If a non-FIN packet is received, the...
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107 { If the device finds that the destination of a packet is not itself and the TTL field of the packet is 1, it will send a TTL timeout ICMP error message. { When the device receives the first fragment of an IP datagram whose destination is the device itself, it starts a timer. If the timer times out be fore all the fragments of the datagram are received, the device will send a reassembly timeout ICMP error packet. • ICMP destination unreachable packets If the device receives an IP pac ket...
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108 Step Command Remarks 3. Enable sending of ICMP timeout packets. ip ttl-expires enable Disabled by default 4. Enable sending of ICMP destination unreachable packets. ip unreachables enable Disabled by default Displaying and maintaining IP performance optimization Task Command Remarks Display TCP connection statistics. display tcp statistics [ | { begin | exclude | include } regular-expression ] Available in any view Display UDP statistics. display udp statistics [ | {...