Specifications
3-12
Cisco MGX 8260 Command Line Interface Guide
Release 1.2, Part Number 78-10987-01 Rev. B0, January, 2002
Chapter 3 Card Management
Configuration Tasks for Cards
Using 1:N NSC Redundancy
A single secondary card can support multiple primary cards. In this configuration, a failure of any of
the primary cards causes a switchover to the designated secondary. After a switchover, the other NSCs
are unprotected until you fix the problem and restore the primary card to the active state.
For example, a 1:2 redundancy configuration with slot 3 covering slot 1 and slot 5 actually has two
redundancy pairs (see Figure 3-2).
Figure 3-2 Normal Operation with 1:2 NSC Redundancy
Slot 1 is paired with slot 3, with slot 1 as the primary. Slot 5 is also paired with slot 3 with slot 5 as the
primary. You can continue to add redundancy pairs to build other ratios of protection. However, you
can only have one secondary slot per MGX 8260 chassis. That single secondary slot protects all primary
NSC cards in the chassis.
If the primary card in slot one fails, the system switches to the secondary NSC, and the secondary NSC
assumes the logical slot number of the card that failed (see Figure 3-3).
DSCSCC
CARD
LINE
1
2
3
4
SCC
CARD
LINE
1
2
3
4
ACTFDX
1
2
3
4
ACTLINE
LAN 1
LAN 2
ALMC
ALMH
CLR
ACO
DISK
PWR A
PWR B
ACTFDX
1
2
3
4
ACTLINE
LAN 1
LAN 2
ALMC
ALMH
CLR
ACO
DISK
PWR A
PWR B
NSC
CARD
LINE
1
2
3
4
13
5
6
7
8
9
10
11
12
14
15
16
DMC
CARD
LINE
1
2
3
4
5
6
NSC
CARD
LINE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NSC
CARD
LINE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NSC
CARD
LINE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NSC
CARD
LINE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NSC
CARD
LINE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
DMC
CARD
LINE
1
2
3
4
5
6
32405
S
econdary card (standby)
Primary cards (active)
Physical slot numbers
Logical slot numbers
1
23456
120456