IPv4 Unicast Routing
ExtremeWare XOS 11.3 Concepts Guide
496
Router Interfaces
The routing software and hardware routes IP traffic between router interfaces. A router interface is
simply a virtual LAN (VLAN) that has an IP address assigned to it.
As you create VLANs with IP addresses belonging to different IP subnets, you can also choose to route
between the VLANs. Both the VLAN switching and IP routing function occur within the switch.
NOTE
Each IP address and mask assigned to a VLAN must represent a unique IP subnet. You cannot configure the same
IP address and subnet on different VLANs.
In
Figure 60
, a BlackDiamond switch is depicted with two VLANs defined;
Finance
and
Personnel
. All
ports on slots 1 and 3 are assigned to
Finance
; all ports on slots 2 and 4 are assigned to
Personnel
.
Finance
belongs to the IP network 192.207.35.0; the router interface for
Finance
is assigned the IP address
192.207.35.1.
Personnel
belongs to the IP network 192.207.36.0; its router interface is assigned IP address
192.207.36.1. Traffic within each VLAN is switched using the Ethernet MAC addresses. Traffic between
the two VLANs is routed using the IP addresses.
Figure 60: Routing between VLANs
Populating the Routing Table
The switch maintains an IP routing table for both network routes and host routes. The table is
populated from the following sources:
●
Dynamically, by way of routing protocol packets or by Internet Control Message Protocol (ICMP)
redirects exchanged with other routers
1
2
3
4
A
B
5
6
7
8
EX_070
1
Finance
Personnel
2
3
4
192.207.36.0
192.207.35.0
192.207.36.14
192.207.35.13
192.207.35.11
192.207.36.12
192.207.36.1
192.207.35.1
Summary of Contents for ExtremeWare XOS 11.3
Page 20: ...Contents ExtremeWare XOS 11 3 Concepts Guide 20...
Page 25: ...1 Using ExtremeWare XOS...
Page 26: ......
Page 38: ...ExtremeWare XOS Overview ExtremeWare XOS 11 3 Concepts Guide 38...
Page 58: ...Accessing the Switch ExtremeWare XOS 11 3 Concepts Guide 58...
Page 146: ...Configuring Slots and Ports on a Switch ExtremeWare XOS 11 3 Concepts Guide 146...
Page 218: ...Status Monitoring and Statistics ExtremeWare XOS 11 3 Concepts Guide 218...
Page 240: ...Virtual LANs ExtremeWare XOS 11 3 Concepts Guide 240...
Page 248: ...Virtual Routers ExtremeWare XOS 11 3 Concepts Guide 248...
Page 278: ...Access Lists ACLs ExtremeWare XOS 11 3 Concepts Guide 278...
Page 288: ...Routing Policies ExtremeWare XOS 11 3 Concepts Guide 288 entry deny_rest if then deny...
Page 344: ...Security ExtremeWare XOS 11 3 Concepts Guide 344...
Page 393: ...2 Using Switching and Routing Protocols...
Page 394: ......
Page 454: ...Spanning Tree Protocol ExtremeWare XOS 11 3 Concepts Guide 454...
Page 484: ...Extreme Standby Router Protocol ExtremeWare XOS 11 3 Concepts Guide 484...
Page 514: ...IPv4 Unicast Routing ExtremeWare XOS 11 3 Concepts Guide 514...
Page 530: ...IPv6 Unicast Routing ExtremeWare XOS 11 3 Concepts Guide 530...
Page 538: ...RIP ExtremeWare XOS 11 3 Concepts Guide 538...
Page 556: ...OSPF ExtremeWare XOS 11 3 Concepts Guide 556...
Page 566: ...OSPFv3 ExtremeWare XOS 11 3 Concepts Guide 566...
Page 589: ...3 Appendixes...
Page 590: ......
Page 640: ...CNA Agent ExtremeWare XOS 11 3 Concepts Guide 640...
Page 670: ...Glossary ExtremeWare XOS 11 3 Concepts Guide 670...
Page 698: ...Index ExtremeWare XOS 11 3 Concepts Guide 698...