Cisco Router IOS XR Getting Started Manual page 62

Integrated Switch System
Table 3-6
Table 3-6
Type
Switch connections
Port configuration
Implementing the Integrated Switch in Cisco IOS XR
When the RP and SCGE node boots to Cisco IOS XR software, rapid spanning tree protocol (RSTP)
starts to run on that node. On the RP, the RSTP configures the state of the 2-GE and inter-RP (backplane)
FE port. RSTP runs on all ports of inter-rack switches in addition to the intra-rack switch ports.
Assigning a Bridge Priority
The switches on the 22-port SCGE, which are connected to each other, form the core of the network. The
RP connections form the edge (regardless of whether the 22-port SCGEs are connected in a full or partial
mesh). In steady state, the integrated switch network has the root in the core. The root is one of the
22-port SCGEs.The following default priorities are achieved with the RSTP software:
•
•
Booting Up the Integrated Switch Network
The bootup behavior of the integrated switch network is slightly different when compared with the
Catalyst 6509-based network. For the 22-port SCGEs, the switching control fabric of the control
Ethernet is brought up at the same time as the Cisco CRS-1 system. Whereas, the Catalyst 6509-based
multichassis control network system is assumed to be up and running before the Cisco CRS-1 boots up.
Initially, the designed system controller (DSC) comes up first, followed by the FCCs and line card
chassis (LCCs).
Reenabling the Ports
Perform this task to reenable the ports if the interfaces on the 22-port SCGE card are in the err-disable
state due to a UDLD failure.
Cisco IOS XR Getting Started Guide
3-24
lists the ROMMON switch configuration.
ROMMON Switch Configuration
Description
The BCM5618s create the intra-rack control network. The BCM5690s
create the inter-rack control network. There are two BCM5690 switches
that are connected through a 10 Gbps stacking link. Port 11 on
BCM5690-sw1 is connected to BCM5618-sw0-GE, which is also referred
to as BCM5618-GE0. This is the link that connects the intra-rack control
network to the inter-rack control network. Port 0 on BCM5618-sw0 is
connected to the control Ethernet port for the CPU.
Both BCM5690 switches are configured to forward traffic only to port 11
of BCM5690-sw1 (for example, the CPU bound port). Because forwarding
is not enabled between any other ports on those switches, the switches can
never participate in a loop. The BCM5618s are configured in a very similar
manner by enabling forwarding to only port 0 (CPU port) of BCM5618-sw0
to or from any other port.
RP is set to 36864.
22-port SCGE is set to 32768.
Chapter 3 Bringing Up the Cisco IOS XR Software on a Multishelf System
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