Brocade Mobility RFS Controller System Reference Guide (Supporting software release 5.5.0.0 and later) - Manual (Page 839)

Brocade Mobility RFS Controller System Reference Guide 827
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The Summary tab describes the following data fields:
4. Select the Refresh button to update the statistics counters to their latest values.
OSPF Neighbors
OSPF
OSPF establishes neighbor relationships to exchange routing updates with other routers. A
controller or service platform supporting OSPF sends hello packets to discover neighbors and elect
a designated router. The hello packet includes link state information and list of neighbors. OSPF is
savvy with layer 2 topologies. If on a point-to-point link, OSPF knows it is sufficient, and the link
stays up. If on a broadcast link, the router waits for election before determining if the link is
functional.
To view OSPF neighbor statistics:
1. Select the Statistics menu from the Web UI.
2. Select a Wireless Controller node from the left navigation pane.
3. Select OSPF from the left-hand side of the UI.
4. Select the Neighbor Info tab.
General The general field displays the router ID assigned for this OSPF connection, RFC compliance information and
LSA data. OSPF version 2 was originally defined within RFC versions 1583 and 2328. The general field
displays whether compliance to these RFCs have been satisfied. The OSPF Link-State Advertisement (LSA)
Throttling feature provides a dynamic mechanism to slow down link-state advertisement updates in OSPF
during times of network instability. It also allows faster OSPF convergence by providing LSA rate limiting in
milliseconds. LSA information is provided for both external and opaque LSAs. Opaque LSAs carrying
type-length-value elements. These extensions allow OSPF to run completely out of band of the data plane
network. This means that it can also be used on non-IP networks, such as optical networks.
ABR/ASBR Lists Autonomous System Boundary Router (ASBR) data relevant to OSPF routing, including the ASBR, ABR
and ABR type. An Area Border Router (ABR) is a router that connects one or more areas to the main backbone
network. It is considered a member of all areas it is connected to. An ABR keeps multiple copies of the
link-state database in memory, one for each area to which that router is connected An ASBR is a router
connected to more than one Routing protocol and exchanges routing information with routers in other
protocols. ASBRs typically also run an exterior routing protocol (for example, BGP), or use static routes, or
both. An ASBR is used to distribute routes received from other, external ASs throughout its own autonomous
system. Routers in other areas use ABR as next hop to access external addresses. Then the ABR forwards
packets to the ASBR announcing the external addresses
SPF Refer to the SPF field to assess the status of the shortest path forwarding (SFF) execution, last SPF execution,
SPF delay, SPF due in, SPF hold multiplier, SPF hold time, SPF maximum hold time and SPF timer due flag.
Stub Router The summary screen displays information relating to stub router advertisements and shutdown and startup
times. An OSPF stub router advertisement allows a new router into a network without immediately routing
traffic through the new router and allows a graceful shut down or reload a router without dropping packets
that are destined for other networks. This feature introduces three configuration options that allow you to
configure a router that is running the OSPF protocol to advertise a maximum or infinite metric to all neighbors.