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ip netdirbcast, ip mtu

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ProSafe M4100 and M7100 Managed Switches ip netdirbcast This command enables the forwarding of network-directed broadcasts. When enabled, network directed broadcasts are forwarded. When disabled they are dropped. Default Format Mode disabled ip netdirbcast Interface Config no ip netdirbcast This command disables the forwarding of network-directed broadcasts. When disabled, network directed broadcasts are dropped. Format Mode no ip netdirbcast Interface Config ip mtu This command sets the IP maximum transmission unit (MTU) on a routing interface. The IP MTU is the size of the largest IP packet that can be transmitted on the interface without fragmentation. The software currently does not fragment IP packets. • Packets forwarded in hardware ignore the IP MTU. • Packets forwarded in software are dropped if they exceed the IP MTU of the outgoing interface. Packets originated on the router, such as OSPF packets, might be fragmented by the IP stack. The IP stack uses its default IP MTU and ignores the value set using the ip mtu command. OSPF advertises the IP MTU in the Database Description packets it sends to its neighbors during database exchange. If two OSPF neighbors advertise different IP MTUs, they will not form an adjacency. (unless OSPF has been instructed to ignore differences in IP MTU with the ip ospf mtu-ignore command.) Note: The IP MTU size refers to the maximum size of the IP packet (IP Header + IP payload). It does not include any extra bytes that might be required for Layer-2 headers. To receive and process packets, the Ethernet MTU (see mtu on page 23) must take into account the size of the Ethernet header. Default 1500 bytes Routing Commands 233

Section	Page
ProSafe Managed Switch	1
Contents	3
1. Using the Command-Line Interface	7
Licensing and Command Support	8
Command Syntax	9
Command Conventions	9
Common Parameter Values	10
Slot/Port Naming Convention	11
Using a Command’s “No” Form	12
Managed Switch Modules	12
Command Modes	12
Command Completion and Abbreviation	16
CLI Error Messages	16
CLI Line-Editing Conventions	17
Using CLI Help	17
Accessing the CLI	18
2. Switching Commands	19
Port Configuration Commands	21
Loopback Interface Commands	27
Spanning Tree Protocol (STP) Commands	30
VLAN Commands	47
Double VLAN Commands	60
Voice VLAN Commands	63
Provisioning (IEEE 802.1p) Commands	65
Protected Ports Commands	65
Private VLAN	68
GARP Commands	71
GVRP Commands	73
GMRP Commands	75
Port-Based Network Access Control Commands	77
802.1X Supplicant Commands	91
Storm-Control Commands	94
Flow Control Commands	104
Port-Channel/LAG (802.3ad) Commands	105
Port Mirroring	121
Static MAC Filtering	123
DHCP L2 Relay Agent Commands	127
DHCP Client Commands	131
DHCP Snooping Configuration Commands	132
Dynamic ARP Inspection Commands	141
IGMP Snooping Configuration Commands	148
IGMP Snooping Querier Commands	157
MLD Snooping Commands	161
MLD Snooping Querier Commands	168
set mld querier	168
set mld querier query_interval	169
set mld querier timer expiry	169
set mld querier election participate	170
show mldsnooping querier	170
Port Security Commands	171
LLDP (802.1AB) Commands	175
LLDP-MED Commands	184
Denial of Service Commands	193
MAC Database Commands	203
ISDP Commands	205
Priority-Based Flow Control Commands	210
3. Multicast VLAN Registration (MVR)	213
About MVR	214
MVR Commands	214
4. Routing Commands	221
Address Resolution Protocol (ARP) Commands	222
IP Routing Commands	227
Router Discovery Protocol Commands	244
Virtual LAN Routing Commands	248
Virtual Router Redundancy Protocol Commands	249
DHCP and BOOTP Relay Commands	257
IP Helper Commands	259
Open Shortest Path First (OSPF) Commands	263
OSPF Graceful Restart Commands	304
nsf	305
nsf restart-interval	305
nsf helper	306
nsf helper disable	307
nsf [ietf] helper strict-lsa-checking	307
OSPF Interface Flap Dampening Commands	309
Routing Information Protocol (RIP) Commands	311
ICMP Throttling Commands	318
5. IP Multicast Commands	321
Multicast Commands	321
DVMRP Commands	326
PIM Commands	331
Internet Group Message Protocol (IGMP) Commands	342
IGMP Proxy Commands	349
6. IPv6 Commands	355
Tunnel Interface Commands	356
IPv6 Routing Commands	357
OSPFv3 Commands	380
OSPFv3 Graceful Restart Commands	411
DHCPv6 Commands	413
7. IPv6 Multicast Commands	421
IPv6 Multicast Forwarder Commands	422
IPv6 PIM Commands	424
IPv6 MLD Commands	431
IPv6 MLD-Proxy Commands	437
8. Quality of Service (QoS) Commands	443
Class of Service (CoS) Commands	444
Differentiated Services (DiffServ) Commands	451
DiffServ Class Commands	452
DiffServ Policy Commands	461
DiffServ Service Commands	466
DiffServ Show Commands	468
MAC Access Control List (ACL) Commands	473
IP Access Control List (ACL) Commands	478
IPv6 Access Control List (ACL) Commands	484
Time Range Commands for Time-Based ACLs	488
AutoVOIP	490
iSCSI Commands	494
9. Power over Ethernet (PoE) Commands	501
About PoE	501
PoE Commands	502
10. Utility Commands	512
Auto Install Commands	513
Dual Image Commands	515
System Information and Statistics Commands	517
Logging Commands	534
Email Alerting and Mail Server Commands	539
System Utility and Clear Commands	546
Simple Network Time Protocol (SNTP) Commands	556
DHCP Server Commands	564
DNS Client Commands	575
Packet Capture Commands	580
Serviceability Packet Tracing Commands	583
Cable Test Command	603
sFlow Commands	604
Software License Commands	609
IP Address Conflict Commands	610
Link Local Protocol Filtering Commands	611
RMON Stats and History Commands	612
UDLD Commands	618
USB commands	620
11. Management Commands	623
Configuring the Switch Management CPU	624
Network Interface Commands	626
Console Port Access Commands	629
Telnet Commands	631
Secure Shell (SSH) Commands	636
Management Security Commands	639
Hypertext Transfer Protocol (HTTP) Commands	640
Access Commands	647
User Account Commands	647
SNMP Commands	670
RADIUS Commands	680
TACACS+ Commands	693
Configuration Scripting Commands	698
Pre-Login Banner and System Prompt Commands	700
Switch Database Management (SDM) Templates	701
IPv6 Management Commands	703
12. Log Messages	708
Core	709
Utilities	711
Management	713
Switching	717
QoS	723
Routing/IPv6 Routing	724
Multicast	727
Stacking	729
Technologies	730
O/S Support	732
13. Green Ethernet Commands	734
Energy-Detect Mode	735
Energy Efficient Ethernet (EEE)	735

Match case Limit results 1 per page

Routing Commands

233

ProSafe M4100 and M7100 Managed Switches

ip netdirbcast

This command enables the forwarding of network-directed broadcasts. When enabled,

network directed broadcasts are forwarded. When disabled they are dropped.

Default

Format

ip netdirbcast

Mode

no ip netdirbcast

This command disables the forwarding of network-directed broadcasts. When disabled,

network directed broadcasts are dropped.

Format

no ip netdirbcast

Mode

ip mtu

This command sets the IP maximum transmission unit (MTU) on a routing interface. The IP

MTU is the size of the largest IP packet that can be transmitted on the interface without

fragmentation. The software currently does not fragment IP packets.

•

Packets forwarded in hardware ignore the IP MTU.

•

Packets forwarded in software are dropped if they exceed the IP MTU of the outgoing

interface.

Packets originated on the router, such as OSPF packets, might be fragmented by the IP

stack. The IP stack uses its default IP MTU and ignores the value set using the ip mtu

command.

OSPF advertises the IP MTU in the Database Description packets it sends to its neighbors

during database exchange. If two OSPF neighbors advertise different IP MTUs, they will not

form an adjacency. (unless OSPF has been instructed to ignore differences in IP MTU with

the

ip ospf mtu-ignore

command.)

Note:

The IP MTU size refers to the maximum size of the IP packet (IP

Header + IP payload). It does not include any extra bytes that might

be required for Layer-2 headers. To receive and process packets,

the Ethernet MTU (see

mtu

on page

23) must take into account the

size of the Ethernet header.

disabled

Interface Config

Default

1500 bytes