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HP 5500 Ei 5500 Si Switch Series Configuration Guide

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Page 581

 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...

Page 582

 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...

Page 583

 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...

Page 584

 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...

Page 585

 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...

Page 586

 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...

Page 587

 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...

Page 588

 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...

Page 589

 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...

Page 590

 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
 [ | {...
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