Chapter 5. System management connectivity 105
We recommend, for redundancy in multiple shelf pair networks, that the
System Manager workstation within a site be set up for DHCP so that it may
connect to any shelf within the site that has DHCP enabled.
Internal IP addresses (determined through the Ethernet Hubbing Group and
Shelf Identifier values), in conjunction with the internal OSPF, provide
intershelf communications.
Table 16 shows the hub site IP addressing scheme; see Figure 55 on page 103.
Table 16. Single GNE environment - Hub site IP addressing scheme
Table 17 shows the remote site IP addressing scheme; see Figure 55 on
page 103.
Table 17. Single GNE environment - Remote site IP addressing scheme
If you plan to route your IBM 2029 system management traffic through a
non-secure IP network (for example, through the Internet), you should consider
using a Virtual Private Network (VPN). A VPN creates a secure private
connection that essentially acts like a point-to-point connection.
For more detailed information concerning IP network planning, refer to IP
Network Design Guide, SG24-2580.
5.3.4 Connecting via an IP network in a dual GNE environment
The IBM 2029 supports the use of Open Shortest Path First (OSPF) in a GNE as
the mechanism of IP connectivity between the IBM 2029 network and an external
Parameter Shelf Band 1 Shelf Band 2 Shelf Band 5 Shelf Band 6
Primary Shelf Address 172.16.10.33 172.16.10.33 172.16.10.33 172.16.10.33
Shelf Address 172.16.10.1 172.16.10.33 172.16.10.34 172.16.10.35
Netmask 255.255.255.0 255.255.255.255 255.255.255.255 255.255.255.255
DHCP Address 0.0.0.0 0.0.0.0 0.0.0.0 0.0.0.0
Default Gateway Address 172.16.10.2 0.0.0.0 0.0.0.0 0.0.0.0
Shelf Identifier1256
Ethernet Hubbing Group1111
External Mgr Address 172.31.30.3 172.31.30.3 172.31.30.3 172.31.30.3
Parameter Shelf Band 1 Shelf Band 2 Shelf Band 5 Shelf Band 6
Primary Shelf Address 172.16.10.33 172.16.10.33 172.16.10.33 172.16.10.33
Shelf Address 172.16.10.36 172.16.10.37 172.16.10.38 172.16.10.39
Netmask 255.255.255.255 255.255.255.255 255.255.255.255 255.255.255.255
DHCP Address 0.0.0.0 0.0.0.0 0.0.0.0 0.0.0.0
Default Gateway Address 0.0.0.0 0.0.0.0 0.0.0.0 0.0.0.0
Shelf Identifier 9 10 13 14
Ethernet Hubbing Group2222
External Mgr Address 172.31.30.3 172.31.30.3 172.31.30.3 172.31.30.3
106 Fiber Saver (2029) Implementation Guide
IP network. This allows the use of two GNEs at different IBM 2029 sites,
connected through two or more external OSPF enabled routers, to provide
redundancy and higher availability for the external monitoring and management
of the IBM 2029 network. See Figure 56 on page 107.
OSPF is described in:
RFC 2178, OSPF Version 2
RFC 1131, OSPF Specification
Open Shortest Path First is a dynamic interior gateway protocol that uses a link
state protocol and a shortest path first algorithm to create a topology database of
an IP network.
OSPF routers maintain the operating status of their interfaces and the cost for
sending traffic on these interfaces. This information is then exchanged with other
OSPF routers allowing all routers within an OSPF area to have a common view of
the network topology. Changes in the network topology are quickly updated to all
routers within the OSPF area. Enabling the OSPF function in the GNEs allows the
GNEs to participate in the OSPF area of their attaching routers.
Note that the IBM 2029 shelves form an internal OSPF router network which
ensures that all shelves are aware of routes to each other. This internal OSPF
network is architected in the IBM 2029 design. It is in operation regardless of
whether the IBM 2029 network is:
1. In a stand alone environment
2. Connected to an external IP network through a single GNE in a proxy ARP
environment
3. Connected to an external IP network through dual GNEs and an external
OSPF router environment
This internal OSPF shelf network should not be confused with enabling the OSPF
function in the GNEs to connect to an external OSPF router network.

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