Assume the following user configuration.
The FC mapping to the sets and the default forwarding set election are illustrated in Figure: Default forwarding set election.
All sets and RSVP-TE LSPs outside of the three class-forwarding sets are up initially.
Set 1 is elected as the default class-forwarding set (because the user did not configure an initial default set).
If All LSPs in Set 1 go operationally down, Set 2 is elected as the default class-forwarding set.
If Set 2 subsequently goes down, Set 3 is elected as the default class-forwarding set.
If Set 3 subsequently goes down, then packets of BGP prefixes are ECMP sprayed over the remaining non-CBF RSVP-TE LSPs.
If Set 2 comes back up, then Set 2 is elected as the default class-forwarding set.
*A:Reno 194>config>router# info
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#--------------------------------------------------
echo "IP Configuration"
#--------------------------------------------------
interface "system"
address 192.0.2.194/32
ipv6
address 3ffe::a14:194/128
exit
no shutdown
exit
interface "toSim199"
address 10.202.5.194/24
secondary 10.101.0.194/32
port 1/1/1
ipv6
address 2001:db8:a0b:12f0::1/64
exit
no shutdown
exit
interface "toSim213"
address 10.202.4.194/24
port 1/1/2
no shutdown
exit
interface "toSim219"
address 10.202.8.194/24
port 1/1/3
no shutdown
exit
class-forwarding
// Enables CBF feature for BGP and CPM traffic
*A:Reno 194>config>router>isis# info
----------------------------------------------
igp-shortcut
// Enables IGP shortcut in this ISIS instance with both families IPv4 and IPv6
resolving to RSVP-TE LSPs
tunnel-next-hop
family ipv4
resolution filter
resolution-filter
rsvp
exit
exit
family ipv6
resolution filter
resolution-filter
rsvp
exit
exit
exit
no shutdown
exit
no shutdown
----------------------------------------------
*A:Reno 194>config>router>mpls# info
----------------------------------------------
class-forwarding-policy cbf1
fc be forwarding-set 1
fc l2 forwarding-set 1
fc af forwarding-set 2
fc l1 forwarding-set 2
fc h2 forwarding-set 2
fc ef forwarding-set 3
fc h1 forwarding-set 3
fc nc forwarding-set 3
cspf-on-loose-hop
exit
interface "system"
no shutdown
exit
interface "toSim199"
no shutdown
exit
interface "toSim213"
admin-group "olive"
no shutdown
exit
interface "toSim219"
no shutdown
exit
path "empty"
no shutdown
exit
lsp "RSVP-TE_LSP-BB1-SET1[1..4]" // Four LSPs in Set1
shutdown
to 192.0.2.194/32
cspf
class-forwarding
forwarding-set policy ‟cbf1” set 1
exit
primary "empty"
exit
exit
no shutdown
lsp "RSVP-TE_LSP-BB1-SET2[1..4]" // Four LSPs in Set2
shutdown
to 192.0.2.194/32
cspf
class-forwarding
forwarding-set policy ‟cbf1” set 2
exit
primary "empty"
exit
exit
lsp "RSVP-TE_LSP-BB1-SET3[1..4]" // Four LSPs in Set3
shutdown
to 192.0.2.194/32
cspf
class-forwarding
forwarding-set policy ‟cbf1” set 3
exit
primary "empty"
exit
exit
lsp "RSVP-TE_LSP-BB1[1..52]" //
Other LSP configuration with no CBF options for a total of 64 LSPs to BB1
shutdown
to 192.0.2.194/32
cspf
primary "empty"
exit
exit
no shutdown
----------------------------------------------