Display examples are provided for the following routers in the configuration shown in the preceding MPLS fast reroute configuration diagram.
The following examples include displays for the show mpls rsvp session and show mpls rsvp session detail commands.
The following display examples are from transit router1. Displays are shown for the show mpls rsvp session and show mpls rsvp session detail commands.
The display for transit router1 shows a transit detour (DT) path. The DT path is the detour path that is an alternative to the primary path configured on ingress router4 from ingress router4 to egress router5. This detour path shown from ingress router4 at loopback IP address 10.4.4.4 to egress router5 at loopback IP address 10.5.5.5 is only used when there is a failed link or router between the source and destination of the primary path.
device1# show mpls rsvp session
Codes: DI:Ingress Detour DT:Transit Detour DM:Merged Detour
DE:Egress Detour RP:Repaired Session
Ingress RSVP: 0 session(s)
Transit RSVP: 1 session(s)
To From St Style Lbl_in Lbl_out LSPname
10.5.5.5 10.4.4.4(DT) Up SE 1028 3 1
Egress RSVP: 0 session(s)
The following example displays the output from transit router1 using the show mpls rsvp session detail command. This option provides additional details about the paths described in the output from the show mpls rsvp session command.
For the DT path, the "Explicit path hop count" field indicates that there is one hop from this router to the egress of the path at the router at IP address 10.15.15.2 (egress router5).
device3# show mpls rsvp session detail Ingress RSVP: 0 session(s) Transit RSVP: 1 session(s) To From St Style Lbl_in Lbl_out LSPname 10.5.5.5 10.4.4.4(DT) Up SE 1028 3 1 Time left in seconds (PATH refresh: 18, ttd: 146 RESV refresh: 15, ttd: 154) Tspec: peak 0 kbps rate 0 kbps size 0 bytes m 20 M 1500 Explicit path hop count: 1 10.15.15.2 (S) Received RRO count: 1 Protection codes: P: Local N: Node B: Bandwidth I: InUse 10.15.15.2 PATH rcvfrom: 10.11.11.1 (e7/16) (MD5 OFF) PATH sentto: 10.15.15.2 (e6/2 ) (MD5 OFF) RESV rcvfrom: 10.15.15.2 (e6/2 ) (MD5 OFF) Egress RSVP: 0 session(s)
The following display examples are from transit router2. Displays are shown for the show mpls rsvp session and show mpls rsvp session detail commands.
As for transit router2, the displays show an ingress detour (DI) path, and a path without a code which identifies a protected path. In addition, a merged detour (DM) path is shown. The DM path is the detour path merged from transit router6. All three paths are shown from ingress router4 at loopback IP address 10.4.4.4 to egress router 5at loopback IP address 10.5.5.5 .
device1# show mpls rsvp session
Codes: DI:Ingress Detour DT:Transit Detour DM:Merged Detour
DE:Egress Detour RP:Repaired Session
Ingress RSVP: 0 session(s)
Transit RSVP: 1 session(s)
To From St Style Lbl_in Lbl_out LSPname
10.5.5.5 10.4.4.4(DI) Up SE 1024 1024 1
10.5.5.5 10.4.4.4 Up SE 1024 1024 1
10.5.5.5 10.4.4.4(DM) Up SE 1025 1024 1
Egress RSVP: 0 session(s)
The following example displays the output from transit router2 using the show mpls rsvp session detail command. This command provides additional details about the paths described in the output from the show mpls rsvp session command.
For the DI path, two PLR and avoid node ID pairs are shown labeled [1] and [2]. In [1] the point of local repair (PLR) is at IP address 10.18.18.1 which is the interface to the primary path on transit router2 and the avoid node is IP address 10.18.18.2 on transit router6. In [2] the PLR is at IP address 10.19.19.2 on transit router6 and the avoid node is IP address 0.0.0.0 . The "Explicit path hop count" field indicates that there are four hops on this path from this router to the egress of the path at routers with the following IP addresses 10.13.13.1 (ingress router4), 10.10.10.1 (transit router3), 10.11.11.2 (transit router1), and 10.15.15.2 (egress router5).
For the DM path, one PLR and avoid node ID pair is shown labeled [1]. In [1], the PLR is at IP address 10.19.19.2 which is an interface on transit router6 and the avoid node is IP address 0.0.0.0 .
For the primary path, the "Explicit path hop count" field indicates that the path has two hops from this router to the egress to the path at routers with the following IP addresses 10.18.18.2 (transit router6) and 10.19.19.1 (egress router5). The 'Fast Reroute' field indicates that the primary path has been configured for one-to-one backup.
device2# show mpls rsvp session detail
Codes: DI:Ingress Detour DT:Transit Detour DM:Merged Detour
DE:Egress Detour RP:Repaired Session
Ingress RSVP: 0 session(s)
Transit RSVP: 1 session(s)
To From St Style Lbl_in Lbl_out LSPname
10.5.5.5 10.4.4.4(DI) Up SE 1024 1024 1
Time left in seconds (PATH refresh: 1, ttd: 4293570
RESV refresh: 13, ttd: 141)
Tspec: peak 0 kbps rate 0 kbps size 0 bytes m 20 M 1500
Explicit path hop count: 4
10.13.13.1 (S) -> 10.10.10.1 (S) -> 10.11.11.2 (S) -> 10.15.15.2 (S)
Received RRO count: 4
Protection codes: P: Local N: Node B: Bandwidth I: InUse
10.13.13.1 -> 10.10.10.1 -> 10.11.11.2 ->
10.15.15.2
Detour Sent: Number of PLR and Avoid Node ID pair(s): 2
[1]: PLR: 10.18.18.1 Avoid Node: 10.18.18.2
[2]: PLR: 10.19.19.2 Avoid Node: 0.0.0.0
PATH sentto: 10.13.13.1 (e5/10 ) (MD5 OFF)
RESV rcvfrom: 10.13.13.1 (e5/10 ) (MD5 OFF)
To From St Style Lbl_in Lbl_out LSPname
10.5.5.5 10.4.4.4 Up SE 1024 1024 1
Time left in seconds (PATH refresh: 26, ttd: 151
RESV refresh: 13, ttd: 151)
Tspec: peak 0 kbps rate 0 kbps size 0 bytes m 20 M 1500
Fast Reroute: one-to-one backup desired
Setup priority: 7, hold priority: 0
Bandwidth: 0 kbps, hop limit: 255
Detour LSP: UP. Nexthop (node) protection available.
Up/Down times: 1, num retries: 0
Explicit path hop count: 2
10.18.18.2 (S) -> 10.19.19.1 (S)
Received RRO count: 2
Protection codes: P: Local N: Node B: Bandwidth I: InUse
10.18.18.2 (PN) -> 10.19.19.1
PATH rcvfrom: 10.13.13.1 (e5/10 ) (MD5 OFF)
PATH sentto: 10.18.18.2 (e2/1 ) (MD5 OFF)
RESV rcvfrom: 10.18.18.2 (e2/1 ) (MD5 OFF)
To From St Style Lbl_in Lbl_out LSPname
10.5.5.5 10.4.4.4(DM) Up SE 1025 1024 1
Time left in seconds (PATH refresh: 31, ttd: 133
RESV refresh: 13, ttd: 141)
Tspec: peak 0 kbps rate 0 kbps size 0 bytes m 20 M 1500
Received RRO count: 4
Protection codes: P: Local N: Node B: Bandwidth I: InUse
10.13.13.1 -> 10.10.10.1 -> 10.11.11.2 ->
10.15.15.2
Detour Rcvd: Number of PLR and Avoid Node ID pair(s): 1
[1]: PLR: 10.19.19.2 Avoid Node: 0.0.0.0
PATH rcvfrom: 10.18.18.2 (e2/1 ) (MD5 OFF)
RESV rcvfrom: 10.13.13.1 (e5/10 ) (MD5 OFF)
Egress RSVP: 0 session(s)
The following display examples come from transit router3. Displays are shown for the show mpls rsvp session and show mpls rsvp session detail commands.
The display for transit router3 shows a transit detour (DT) path. The DT path is the detour path that is an alternative to the primary path configured on ingress router4 from itself to egress router5. This detour path, shown from ingress router4 at loopback IP address 10.4.4.4 to egress router5 at loopback IP address 10.5.5.5 , is only used when a link or router fails between the source and destination of the primary path.
device3# show mpls rsvp session
Codes: DI:Ingress Detour DT:Transit Detour DM:Merged Detour
DE:Egress Detour RP:Repaired Session
Ingress RSVP: 0 session(s)
Transit RSVP: 1 session(s)
To From St Style Lbl_in Lbl_out LSPname
10.5.5.5 10.4.4.4(DT) Up SE 1028 1028 1
Egress RSVP: 0 session(s)
The following example displays the output from transit router3 using the show mpls rsvp session detail command. This command provides additional details about the paths described in the output from the show mpls rsvp session command.
For the DT path, the "Explicit path hop count:" field shows that two hops exist from this router to the egress of the path at routers with the following at IP addresses: 10.11.11.2 (transit router1) and 10.15.15.2 (egress router5).
device3# show mpls rsvp session detail
Codes: DI:Ingress Detour DT:Transit Detour DM:Merged Detour
DE:Egress Detour RP:Repaired Session
Ingress RSVP: 0 session(s)
Transit RSVP: 1 session(s)
To From St Style Lbl_in Lbl_out LSPname
10.5.5.5 10.4.4.4(DT) Up SE 1028 1028 1
Time left in seconds (PATH refresh: 2, ttd: 141
RESV refresh: 25, ttd: 154)
Tspec: peak 0 kbps rate 0 kbps size 0 bytes m 20 M 1500
Explicit path hop count: 2
10.11.11.2 (S) -> 10.15.15.2 (S)
Received RRO count: 2
Protection codes: P: Local N: Node B: Bandwidth I: InUse
10.11.11.2 -> 10.15.15.2
PATH rcvfrom: 10.10.10.2 (e12/1 ) (MD5 OFF)
PATH sentto: 10.11.11.2 (e11/18 ) (MD5 OFF)
RESV rcvfrom: 10.11.11.2 (e11/18 ) (MD5 OFF)
Egress RSVP: 0 session(s)
The following display examples are from ingress router4. Displays are shown for the show mpls rsvp session and show mpls rsvp session detail commands.
Similar to the display for transit router2, the displays show an ingress detour (DI) path, a path without a code which identifies a protected path and merged detour (DM) path. The DM path is the detour path merged from transit routers 2 and 6. All three paths are shown from ingress router4 at IP address loopback 10.4.4.4 to egress router5 at IP address loopback 10.5.5.5 . In the case of the DM path, a reroute at either transit router 2 or 6 sends traffic that had begun at ingress router4 back through it, and forward through transit routers 3 and 1 to the ultimate destination at egress router5.
device4# show mpls rsvp session
Codes: DI:Ingress Detour DT:Transit Detour DM:Merged Detour
DE:Egress Detour RP:Repaired Session
Ingress RSVP: 1 session(s)
To From St Style Lbl_in Lbl_out LSPname
10.5.5.5 10.4.4.4(DI) Up SE - 1028 1
10.5.5.5 10.4.4.4(DM) Up SE 1024 1028 1
10.5.5.5 10.4.4.4 Up SE - 1024 1
Transit RSVP: 0 session(s)
Egress RSVP: 0 session(s)
The following example displays the show mpls rsvp session detail output for ingress router4. This command provides additional details about the paths described in the output from the show mpls rsvp session command.
For the DI path, three PLR and avoid node ID pairs are shown labeled [1], [2] and [3]. In [1] and [2] the PLR is at IP Address 10.13.13.1 which is the interface to the primary path on ingress router4. The avoid node for pair [1] is IP address 10.13.13.2 on transit router2 and the avoid node for pair [2] is IP address 10.18.18.2 on transit router6. In [3] the PLR is at IP address 10.18.18.1 which is the interface to the primary path on ingress router2 and the avoid node for pair [3] is IP address 10.18.18.2 on transit router6. The "Explicit path hop count" field indicates that there are three hops on the path from this router to the egress of the path at routers with the following IP addresses 10.10.10.1 (transit router3), 10.11.11.2 (transit router1) and 10.15.15.2 (egress router5).
For the DM path, one PLR and avoid node ID pair is shown labeled [1]. In [1] the PLR is at IP address 10.18.18.1 which is the interface to the primary path on ingress router2 and the avoid node is IP address 10.18.18.2 on transit router6.
For the primary path, the "Explicit path hop count" field indicates that there are three hops on this path from ingress router4 to the egress to the path at routers with the following IP addresses 10.13.13.2 (transit router2), 10.18.18.2 (transit router6) and 10.19.19.1 (egress router5). The "Fast Reroute" field indicates that the primary path has been configured for one-to-one backup.
device4# show mpls rsvp session detail
Codes: DI:Ingress Detour DT:Transit Detour DM:Merged Detour
DE:Egress Detour RP:Repaired Session
Ingress RSVP: 1 session(s)
To From St Style Lbl_in Lbl_out LSPname
10.5.5.5 10.4.4.4(DI) Up SE - 1028n 1
Time left in seconds (PATH refresh: 16, ttd: 4293608
RESV refresh: 27, ttd: 133)
Tspec: peak 0 kbps rate 0 kbps size 0 bytes m 20 M 65535
Explicit path hop count: 3
10.10.10.1 (S) -> 10.11.11.2 (S) -> 10.15.15.2 (S)
Received RRO count: 3
Protection codes: P: Local N: Node B: Bandwidth I: InUse
10.10.10.1 -> 10.11.11.2 -> 10.15.15.2
Detour Sent: Number of PLR and Avoid Node ID pair(s): 3
[1]: PLR: 10.13.13.1 Avoid Node: 10.13.13.2
[2]: PLR: 10.13.13.1 Avoid Node: 10.18.18.2
[3]: PLR: 10.18.18.1 Avoid Node: 10.18.18.2
PATH sentto: 10.10.10.1 (e2/1 ) (MD5 OFF)
RESV rcvfrom: 10.10.10.1 (e2/1 ) (MD5 OFF)
To From St Style Lbl_in Lbl_out LSPname
10.5.5.5 10.4.4.4(DM) Up SE 1024 1028 1
Time left in seconds (PATH refresh: 6, ttd: 134
RESV refresh: 27, ttd: 133)
Tspec: peak 0 kbps rate 0 kbps size 0 bytes m 20 M 1500
Received RRO count: 3
Protection codes: P: Local N: Node B: Bandwidth I: InUse
10.10.10.1 -> 10.11.11.2 -> 10.15.15.2
Detour Rcvd: Number of PLR and Avoid Node ID pair(s): 1
[1]: PLR: 10.18.18.1 Avoid Node: 10.18.18.2
PATH rcvfrom: 10.13.13.2 (e2/20 ) (MD5 OFF)
RESV rcvfrom: 10.10.10.1 (e2/1 ) (MD5 OFF)
To From St Style Lbl_in Lbl_out LSPname
10.5.5.5 10.4.4.4 Up SE - 1024 1
Time left in seconds (PATH refresh: 37, ttd: 148
RESV refresh: 27, ttd: 152)
Tspec: peak 0 kbps rate 0 kbps size 0 bytes m 20 M 65535
Fast Reroute: one-to-one backup desired
Setup priority: 7, hold priority: 0
Bandwidth: 0 kbps, hop limit: 255
Detour LSP: UP. Nexthop (node) protection available.
Up/Down times: 1, num retries: 0
Explicit path hop count: 3
10.13.13.2 (S) -> 10.18.18.2 (S) -> 10.19.19.1 (S)
Received RRO count: 3
Protection codes: P: Local N: Node B: Bandwidth I: InUse
10.13.13.2 (PN) -> 10.18.18.2 (PN) -> 10.19.19.1
PATH sentto: 10.13.13.2 (e2/20 ) (MD5 OFF)
RESV rcvfrom: 10.13.13.2 (e2/20 ) (MD5 OFF)
Transit RSVP: 0 session(s)
Egress RSVP: 0 session(s)
The following display examples are from egress router5. Displays are shown for the show mpls rsvp session and show mpls rsvp session detail commands.
The display for egress router5 shows an egress detour (DE) path and a path without a code that identifies a protected path. Both paths are shown from ingress router4 at loopback IP address 10.4.4.4 to egress router5 at loopback IP address 10.5.5.5 . The primary path traverses transit routers 2 and 6. In the case of the DE path, a reroute sends traffic through transit routers 3 and 1.
device5# show mpls rsvp session
Codes: DI:Ingress Detour DT:Transit Detour DM:Merged Detour
DE:Egress Detour RP:Repaired Session
Ingress RSVP: 0 session(s)
Transit RSVP: 0 session(s)
Egress RSVP: 1 session(s)
To From St Style Lbl_in Lbl_out LSPname
10.5.5.5 10.4.4.4(DE) Up SE 3 0 1
10.5.5.5 10.4.4.4 Up SE 3 0 1
The following example displays the output from egress router5 using the show mpls rsvp session detail command. This command provides additional details about the paths described in the output from the show mpls rsvp session command.
For the DE path, two PLR and avoid node ID pairs are shown labeled [1] and [2]. In both the PLR is at IP address 10.13.13.1 which is the interface to the primary path on ingress router4. The avoid node for pair [1] is IP address 10.13.13.2 on transit router2 and the avoid node for pair [2] is IP address 10.18.18.2 on transit router6.
The "Fast Reroute" field indicates that the primary path has been configured for one-to-one backup.
There is no "Explicit path hop count" field for either route because egress router 5 is the destination of the path.
Codes: DI:Ingress Detour DT:Transit Detour DM:Merged Detour
DE:Egress Detour RP:Repaired Session
Ingress RSVP: 0 session(s)
Transit RSVP: 0 session(s)
Egress RSVP: 1 session(s)
To From St Style Lbl_in Lbl_out LSPname
10.5.5.5 10.4.4.4(DE) Up SE 3 0 1
Time left in seconds (PATH refresh: 18, ttd: 149
RESV refresh: 7, ttd: 152)
Tspec: peak 0 kbps rate 0 kbps size 0 bytes m 20 M 1500
Detour Rcvd: Number of PLR and Avoid Node ID pair(s): 2
[1]: PLR: 10.13.13.1 Avoid Node: 10.13.13.2
[2]: PLR: 10.13.13.1 Avoid Node: 10.18.18.2
PATH rcvfrom: 10.15.15.1 (e8/2 ) (MD5 OFF)
To From St Styl Lbl_in Lbl_outm LSPname
10.5.5.5 10.4.4.4 Up SE 3 0 1
Time left in seconds (PATH refresh: 30, ttd: 152
RESV refresh: 7, ttd: 152)
Tspec: peak 0 kbps rate 0 kbps size 0 bytes m 20 M 1500
Fast Reroute: one-to-one backup desired
Setup priority: 7, hold priority: 0
Bandwidth: 0 kbps, hop limit: 255
PATH rcvfrom: 10.19.19.2 (e8/1) (MD5 OFF)
The following display examples are from transit router6. Displays are shown for the show mpls rsvp session and show mpls rsvp session detail commands.
Both displays show two paths from ingress router4 at loopback IP address 10.4.4.4 to egress router5 at loopback IP address 10.5.5.5 . The (DI) path is an ingress detour path, and the path without a code is a protected path. The DI path is the detour path that is taken when transit router6 is unable to use the primary path to egress router5.
device6# show mpls rsvp session
Codes: DI:Ingress Detour DT:Transit Detour DM:Merged Detour
DE:Egress Detour RP:Repaired Session
Ingress RSVP: 0 session(s)
Transit RSVP: 1 session(s)
To From St Style Lbl_in Lbl_out LSPname
10.5.5.5 10.4.4.4(DI) Up SE 1024 1025 1
10.5.5.5 10.4.4.4 Up SE 1024 3 1
Egress RSVP: 0 session(s)
The following example displays the output from transit router6 using the show mpls rsvp session detail command. This command provides additional details about the paths described in the output from the show mpls rsvp session command.
For the DI path, one PLR and avoid node ID pair is shown labeled [1]. In [1], the PLR is at IP address 10.19.19.2 which is an interface on transit router6 and the avoid node is IP address 0.0.0.0 . The "Explicit path hop count" field indicates that there are five hops on this path from this router to the egress to the path at routers with the following IP addresses 10.18.18.1 (transit router2), 10.13.13.1 (ingress router4), 10.10.10.1 (transit router3), 10.11.11.2 (transit router1) and 10.15.15.2 (egress router5).
For the primary path, the "Explicit path hop count" field indicates that there is one hop on this path from this router to the egress to the path to the router at IP address 10.19.19.1 (egress router5). The "Fast Reroute" field indicates that the primary path has been configured for one-to-one backup.
device6# show mpls rsvp session detail
Codes: DI:Ingress Detour DT:Transit Detour DM:Merged Detour
DE:Egress Detour RP:Repaired Session
Ingress RSVP: 0 session(s)
Transit RSVP: 1 session(s)
To From St Style Lbl_in Lbl_out LSPname
10.5.5.5 10.4.4.4(DI) Up SE 1024 1025 1
Time left in seconds (PATH refresh: 6, ttd: 4293497
RESV refresh: 24, ttd: 131)
Tspec: peak 0 kbps rate 0 kbps size 0 bytes m 20 M 1500
Explicit path hop count: 5
10.18.18.1 (S) -> 10.13.13.1 (S) -> 10.10.10.1 (S) -> 10.11.11.2 (S) ->
10.15.15.2 (S)
Received RRO count: 5
Protection codes: P: Local N: Node B: Bandwidth I: InUse
10.18.18.1 -> 10.13.13.1 -> 10.10.10.1 ->
10.11.11.2 -> 10.15.15.2
Detour Sent: Number of PLR and Avoid Node ID pair(s): 1
[1]: PLR: 10.19.19.2 Avoid Node: 0.0.0.0
PATH sentto: 10.18.18.1 (e5/1 ) (MD5 OFF)
RESV rcvfrom: 10.18.18.1 (e5/1 ) (MD5 OFF)
To From St Style Lbl_in Lbl_out LSPname
10.5.5.5 10.4.4.4 Up SE 1024 3 1
Time left in seconds (PATH refresh: 28, ttd: 150
RESV refresh: 24, ttd: 128)
Tspec: peak 0 kbps rate 0 kbps size 0 bytes m 20 M 1500
Fast Reroute: one-to-one backup desired
Setup priority: 7, hold priority: 0
Bandwidth: 0 kbps, hop limit: 255
Detour LSP: UP. Nexthop (node) protection available.
Up/Down times: 1, num retries: 0
Explicit path hop count: 1
10.19.19.1 (S)
Received RRO count: 1
Protection codes: P: Local N: Node B: Bandwidth I: InUse
10.19.19.1
PATH rcvfrom: 10.18.18.1 (e5/1 ) (MD5 OFF)
PATH sentto: 10.19.19.1 (e5/2 ) (MD5 OFF)
RESV rcvfrom: 10.19.19.1 (e5/2 ) (MD5 OFF)
Egress RSVP: 0 session(s)