BigIron RX Series Configuration Guide
157
53-1001810-01
Configuring IP parameters
7
Configuring the default gateway
To manage a device using Telnet or Secure Shell (SSH) CLI connections or the Web management
interface, you must configure an IP address for the device.
To configure a default gateway, first define an IP address using the following CLI command.
BigIron RX
(config)# ip address 192.45.6.110 255.255.255.0
Syntax: ip address <ip-addr> <ip-mask>
or
Syntax: ip address <ip-addr>/<mask-bits>
GRE IP tunnel
The BigIron RX allows the tunneling of packets of the following protocols over an IP network using
the Generic Router Encapsulation (GRE) mechanism as described in RFC 2784:
•
OSPF
•
BGP
•
IS-IS point-to-point
Using this feature, packets of these protocols can be encapsulated inside a transport protocol
packet at a tunnel source and delivered to a tunnel destination where it is unpacked and made
available for delivery.
Figure 6
describes the GRE header format.
FIGURE 6
GRE header format
Checksum – This field is assumed to be zero in this version. If set to 1 means that the Checksum
(optional) and Reserved (optional) fields are present and the Checksum (optional) field contains
valid information.
Reserved0 – Bits 6:0 of the field are reserved for future use and must be set to zero in transmitted
packets. If bits 11:7 of the field are non-zero, then a receiver must discard the packet unless RFC
1701 is implemented. This field is assumed to be zero in this version.
Ver – This field must be set to zero. This field is assumed to be zero in this version.
GRE MTU configuration considerations
The default value of IP GRE tunnel MTU is 1476 bytes. The MTU of the GRE tunnel is compared with
the outgoing packet before the encapsulation is done. After the encapsulation, the packet size
increases by 24 bytes. If a user wants to change the GRE tunnel MTU, the MTU should be at least
24 bytes less than the IP MTU of the outgoing interface. Otherwise, the size of the encapsulated
packet will exceed the IP MTU of the outgoing interface. In that case, the packet is dropped if the
DF (Do-Not-Fragment) bit is set in the original IP packet, otherwise, the packet is sent to CPU for
fragmentation.
Checksum
Reserved0
Ver
Protocol Type Checksum
(optional)
Reserved
(optional)
1 bit
12 bits
3 bits
16 bits
16 bits
16 bits
Summary of Contents for Brocade DCX
Page 40: ...xl BigIron RX Series Configuration Guide 53 1001810 01 ...
Page 72: ...lxxii BigIron RX Series Configuration Guide 53 1001810 01 ...
Page 88: ...16 BigIron RX Series Configuration Guide 53 1001810 01 Searching and filtering output 1 ...
Page 300: ...228 BigIron RX Series Configuration Guide 53 1001810 01 Displaying IP information 7 ...
Page 318: ...246 BigIron RX Series Configuration Guide 53 1001810 01 Deploying a LAG 8 ...
Page 418: ...346 BigIron RX Series Configuration Guide 53 1001810 01 SuperSpan 12 ...
Page 482: ...410 BigIron RX Series Configuration Guide 53 1001810 01 MRP CLI example 14 ...
Page 506: ...434 BigIron RX Series Configuration Guide 53 1001810 01 Displaying VSRP information 15 ...
Page 582: ...510 BigIron RX Series Configuration Guide 53 1001810 01 Viewing Layer 2 ACLs 20 ...
Page 634: ...562 BigIron RX Series Configuration Guide 53 1001810 01 Troubleshooting ACLs 21 ...
Page 642: ...570 BigIron RX Series Configuration Guide 53 1001810 01 Trunk formation 22 ...
Page 746: ...674 BigIron RX Series Configuration Guide 53 1001810 01 Displaying RIP filters 24 ...
Page 808: ...736 BigIron RX Series Configuration Guide 53 1001810 01 Displaying OSPF information 25 ...
Page 938: ...866 BigIron RX Series Configuration Guide 53 1001810 01 Displaying MBGP information 27 ...
Page 950: ...878 BigIron RX Series Configuration Guide 53 1001810 01 Using secure copy 28 ...
Page 988: ...916 BigIron RX Series Configuration Guide 53 1001810 01 Clearing IS IS information 29 ...
Page 1054: ...982 BigIron RX Series Configuration Guide 53 1001810 01 Sample 802 1x configurations 33 ...
Page 1108: ...1036 BigIron RX Series Configuration Guide 53 1001810 01 sFlow 39 ...
Page 1190: ...1118 BigIron RX Series Configuration Guide 53 1001810 01 Displaying RIPng information 44 ...
Page 1270: ...1198 BigIron RX Series Configuration Guide 53 1001810 01 Displaying ACLs 47 ...
Page 1310: ...1238 BigIron RX Series Configuration Guide 53 1001810 01 Displaying OSPFv3 information 48 ...
Page 1382: ...1310 BigIron RX Series Configuration Guide 53 1001810 01 Commands That Require a Reload D ...
Page 1435: ...BigIron RX Series Configuration Guide 1363 53 1001810 01 VSRP E ...
Page 1436: ...1364 BigIron RX Series Configuration Guide 53 1001810 01 VSRP E ...