今回はPCEを使用して、OSPFのマルチエリアに跨るSR-TE用のLSPを構築する方法を説明します。
この記事の目次
概要
Disjoint Pathについて
OSPFの仕様上、マルチエリア構成の場合、特定のエリアのルータは別のエリアのTE用のLSAを学習できません。(TE用のLSAのFlooding ScopeがAreaなので)
その結果、各ルータは別のエリアの構造やリンクのColor等が分からないため、複数のエリアに跨るSR-TE用のLSPを構築できません。
複数のエリアに跨るSR-TE用のLSPを構築するには、PCEとBGP-LSを併用する必要があります。
最初に、BGP-LSを使用して、PCEとして動作させるルータに各エリアのLSAを学習させます。そして、Head-endでSR-TE用のLSPを生成する際に、PCEにLSPの計算を依頼します。PCEは各エリアのLSAを学習しているため、複数のエリアに跨るSR-TE用のLSPを計算できます。
検証内容と設定
基本設定の内容
R1-R2間でOSPF Area 0、R2-R3間とR2-R4間とR3-R4間でOSPF Area 1を構成します。
OSPFでSR-TEを有効にします。
R1、R5、R3をAS 100に所属させます。
R1-R5間、R3-R5間でIBGPネイバーを構成します。
R1とR3はR5に対して、IBGP経由でOSPFのLSDBの情報を広報します。
R1-R2間、R2-R4間、R3-R4間のリンクにColor REDを割り当てます。
R2-R3間のリンクにColor BLUEを割り当てます。
R1でLoopback Interfaceの1.1.1.1/32にPrefix SIDとして20101を割り当てます。
R3でLoopback Interfaceの2.2.2.2/32にPrefix SIDとして20201を割り当てます。
R3でLoopback Interfaceの3.3.3.3/32にPrefix SIDとして20301を割り当てます。
R4でLoopback Interfaceの4.4.4.4/32にPrefix SIDとして20401を割り当てます。
R5をPCE、R1をPCCとして動作させます。
初期設定
interface Loopback0
ipv4 address 1.1.1.1 255.255.255.255
!
interface GigabitEthernet0/0/0/0
ipv4 address 10.1.1.1 255.255.255.0
!
interface GigabitEthernet0/0/0/1
ipv4 address 172.16.1.1 255.255.255.0
!
router ospf 1
distribute link-state instance-id 1
router-id 1.1.1.1
segment-routing mpls
area 0
mpls traffic-eng
interface Loopback0
prefix-sid absolute 20101
!
interface GigabitEthernet0/0/0/0
network point-to-point
!
!
!
router bgp 100
bgp router-id 1.1.1.1
address-family ipv4 unicast
!
address-family link-state link-state
!
neighbor 3.3.3.3
remote-as 100
update-source Loopback0
address-family ipv4 unicast
!
!
neighbor 172.16.1.5
remote-as 100
address-family link-state link-state
!
!
!
segment-routing
traffic-eng
interface GigabitEthernet0/0/0/0
affinity
name RED
!
!
affinity-map
name RED bit-position 0
name BLUE bit-position 1
!
pcc
source-address ipv4 172.16.1.1
pce address ipv4 172.16.1.5
interface Loopback0
ipv4 address 2.2.2.2 255.255.255.255
!
interface GigabitEthernet0/0/0/0
ipv4 address 10.1.1.2 255.255.255.0
!
interface GigabitEthernet0/0/0/1
ipv4 address 10.2.2.2 255.255.255.0
!
interface GigabitEthernet0/0/0/2
ipv4 address 10.3.3.2 255.255.255.0
!
router ospf 1
router-id 2.2.2.2
segment-routing mpls
area 0
mpls traffic-eng
interface Loopback0
prefix-sid absolute 20201
!
interface GigabitEthernet0/0/0/0
network point-to-point
!
!
area 1
mpls traffic-eng
interface GigabitEthernet0/0/0/1
network point-to-point
!
interface GigabitEthernet0/0/0/2
network point-to-point
!
!
!
segment-routing
traffic-eng
interface GigabitEthernet0/0/0/0
affinity
name RED
!
!
interface GigabitEthernet0/0/0/1
affinity
name BLUE
!
!
interface GigabitEthernet0/0/0/2
affinity
name RED
!
!
affinity-map
name RED bit-position 0
name BLUE bit-position 1
interface Loopback0
ipv4 address 3.3.3.3 255.255.255.0
!
interface Loopback1
ipv4 address 10.5.5.3 255.255.255.0
!
interface GigabitEthernet0/0/0/0
ipv4 address 10.2.2.3 255.255.255.0
!
interface GigabitEthernet0/0/0/1
ipv4 address 10.4.4.3 255.255.255.0
!
interface GigabitEthernet0/0/0/2
ipv4 address 172.16.1.3 255.255.255.0
!
router ospf 1
distribute link-state instance-id 1
router-id 3.3.3.3
segment-routing mpls
area 1
mpls traffic-eng
interface Loopback0
prefix-sid absolute 20301
!
interface GigabitEthernet0/0/0/0
network point-to-point
!
interface GigabitEthernet0/0/0/1
network point-to-point
!
!
!
router bgp 100
bgp router-id 3.3.3.3
address-family ipv4 unicast
network 10.5.5.0/24
!
address-family link-state link-state
!
neighbor 1.1.1.1
remote-as 100
update-source Loopback0
address-family ipv4 unicast
route-policy BGP_ROUTE_POLICY out
!
!
neighbor 172.16.1.5
remote-as 100
address-family link-state link-state
!
!
!
segment-routing
traffic-eng
interface GigabitEthernet0/0/0/0
affinity
name BLUE
!
!
interface GigabitEthernet0/0/0/1
affinity
name RED
!
!
affinity-map
name RED bit-position 0
name BLUE bit-position 1
!
pcc
source-address ipv4 172.16.1.3
pce address ipv4 172.16.1.5
interface Loopback0
ipv4 address 4.4.4.4 255.255.255.255
!
interface GigabitEthernet0/0/0/0
ipv4 address 10.3.3.4 255.255.255.0
!
interface GigabitEthernet0/0/0/1
ipv4 address 10.4.4.4 255.255.255.0
!
router ospf 1
router-id 4.4.4.4
segment-routing mpls
area 1
mpls traffic-eng
interface Loopback0
prefix-sid absolute 20401
!
interface GigabitEthernet0/0/0/0
network point-to-point
!
interface GigabitEthernet0/0/0/1
network point-to-point
!
!
!
segment-routing
traffic-eng
interface GigabitEthernet0/0/0/0
affinity
name RED
!
!
interface GigabitEthernet0/0/0/1
affinity
name RED
!
!
affinity-map
name RED bit-position 0
name BLUE bit-position 1
pce
address ipv4 172.16.1.5
!
interface GigabitEthernet0/0/0/0
ipv4 address 172.16.1.5 255.255.255.0
!
router bgp 100
bgp router-id 5.5.5.5
address-family link-state link-state
!
neighbor 172.16.1.1
remote-as 100
address-family link-state link-state
!
!
neighbor 172.16.1.3
remote-as 100
address-family link-state link-state
OSPFの状態確認
R1のLSDBを見ると、エリア1のOpaque LSAが存在しないことが確認できます。この結果、R1はエリア1のTE用の情報を認識できていないことが分かります。
R1
RP/0/RP0/CPU0:R1#show ospf database
OSPF Router with ID (1.1.1.1) (Process ID 1)
Router Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Link count
1.1.1.1 1.1.1.1 232 0x80000004 0x002fb2 3
2.2.2.2 2.2.2.2 198 0x80000004 0x00cf08 3
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
3.3.3.3 2.2.2.2 198 0x80000002 0x00d451
4.4.4.4 2.2.2.2 198 0x80000002 0x00a67b
10.2.2.0 2.2.2.2 198 0x80000002 0x00a480
10.3.3.0 2.2.2.2 198 0x80000002 0x008d95
10.4.4.0 2.2.2.2 198 0x80000002 0x00809f
Type-10 Opaque Link Area Link States (Area 0)
Link ID ADV Router Age Seq# Checksum Opaque ID
1.0.0.0 1.1.1.1 231 0x80000003 0x0054d3 0
1.0.0.0 2.2.2.2 198 0x80000002 0x005ac6 0
1.0.0.7 1.1.1.1 231 0x80000002 0x0059a3 7
1.0.0.7 2.2.2.2 198 0x80000002 0x00e01c 7
4.0.0.0 1.1.1.1 231 0x80000003 0x008734 0
4.0.0.0 2.2.2.2 198 0x80000003 0x00a90d 0
7.0.0.1 1.1.1.1 231 0x80000002 0x00dda3 1
7.0.0.1 2.2.2.2 198 0x80000002 0x0024f0 1
7.0.0.2 2.2.2.2 198 0x80000002 0x005118 2
7.0.0.3 2.2.2.2 198 0x80000002 0x00aa55 3
8.0.0.7 1.1.1.1 231 0x80000002 0x00c041 7
8.0.0.7 2.2.2.2 198 0x80000002 0x00f50d 7
BGP-LSの状態確認
R5のBGP-LSのテーブルを見ると、R5はR1～R4のLSAを学習していることが確認できます。
R5
RP/0/RP0/CPU0:R5#show bgp link-state link-state
BGP router identifier 5.5.5.5, local AS number 100
BGP generic scan interval 60 secs
Non-stop routing is enabled
BGP table state: Active
Table ID: 0x0 RD version: 34
BGP main routing table version 34
BGP NSR Initial initsync version 14 (Reached)
BGP NSR/ISSU Sync-Group versions 0/0
BGP scan interval 60 secs
Status codes: s suppressed, d damped, h history, * valid, > best
i - internal, r RIB-failure, S stale, N Nexthop-discard
Origin codes: i - IGP, e - EGP, ? - incomplete
Prefix codes: E link, V node, T IP reacheable route, S SRv6 SID, u/U unknown
I Identifier, N local node, R remote node, L link, P prefix, S SID
L1/L2 ISIS level-1/level-2, O OSPF, D direct, S static/peer-node
a area-ID, l link-ID, t topology-ID, s ISO-ID,
c confed-ID/ASN, b bgp-identifier, r router-ID, s SID
i if-address, n nbr-address, o OSPF Route-type, p IP-prefix
d designated router address
Network Next Hop Metric LocPrf Weight Path
*>i[V][O][I0x1][N[c100][b0.0.0.0][a0.0.0.0][r1.1.1.1]]/376
172.16.1.1 100 0 i
*>i[V][O][I0x1][N[c100][b0.0.0.0][a0.0.0.0][r2.2.2.2]]/376
172.16.1.1 100 0 i
*>i[V][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r2.2.2.2]]/376
172.16.1.3 100 0 i
*>i[V][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r3.3.3.3]]/376
172.16.1.3 100 0 i
*>i[V][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r4.4.4.4]]/376
172.16.1.3 100 0 i
*>i[E][O][I0x1][N[c100][b0.0.0.0][a0.0.0.0][r1.1.1.1]][R[c100][b0.0.0.0][a0.0.0.0][r2.2.2.2]][L[i10.1.1.1][n10.1.1.2]]/792
172.16.1.1 100 0 i
*>i[E][O][I0x1][N[c100][b0.0.0.0][a0.0.0.0][r2.2.2.2]][R[c100][b0.0.0.0][a0.0.0.0][r1.1.1.1]][L[i10.1.1.2][n10.1.1.1]]/792
172.16.1.1 100 0 i
*>i[E][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r2.2.2.2]][R[c100][b0.0.0.0][a0.0.0.1][r3.3.3.3]][L[i10.2.2.2][n10.2.2.3]]/792
172.16.1.3 100 0 i
*>i[E][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r2.2.2.2]][R[c100][b0.0.0.0][a0.0.0.1][r4.4.4.4]][L[i10.3.3.2][n10.3.3.4]]/792
172.16.1.3 100 0 i
*>i[E][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r3.3.3.3]][R[c100][b0.0.0.0][a0.0.0.1][r2.2.2.2]][L[i10.2.2.3][n10.2.2.2]]/792
172.16.1.3 100 0 i
*>i[E][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r3.3.3.3]][R[c100][b0.0.0.0][a0.0.0.1][r4.4.4.4]][L[i10.4.4.3][n10.4.4.4]]/792
172.16.1.3 100 0 i
*>i[E][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r4.4.4.4]][R[c100][b0.0.0.0][a0.0.0.1][r2.2.2.2]][L[i10.3.3.4][n10.3.3.2]]/792
172.16.1.3 100 0 i
*>i[E][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r4.4.4.4]][R[c100][b0.0.0.0][a0.0.0.1][r3.3.3.3]][L[i10.4.4.4][n10.4.4.3]]/792
172.16.1.3 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.0][r1.1.1.1]][P[o0x01][p10.1.1.0/24]]/480
172.16.1.1 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.0][r1.1.1.1]][P[o0x01][p1.1.1.1/32]]/488
172.16.1.1 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.0][r2.2.2.2]][P[o0x01][p10.1.1.0/24]]/480
172.16.1.1 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.0][r2.2.2.2]][P[o0x01][p2.2.2.2/32]]/488
172.16.1.1 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.0][r2.2.2.2]][P[o0x02][p10.2.2.0/24]]/480
172.16.1.1 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.0][r2.2.2.2]][P[o0x02][p10.3.3.0/24]]/480
172.16.1.1 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.0][r2.2.2.2]][P[o0x02][p10.4.4.0/24]]/480
172.16.1.1 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.0][r2.2.2.2]][P[o0x02][p3.3.3.3/32]]/488
172.16.1.1 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.0][r2.2.2.2]][P[o0x02][p4.4.4.4/32]]/488
172.16.1.1 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r2.2.2.2]][P[o0x01][p10.2.2.0/24]]/480
172.16.1.3 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r2.2.2.2]][P[o0x01][p10.3.3.0/24]]/480
172.16.1.3 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r2.2.2.2]][P[o0x02][p10.1.1.0/24]]/480
172.16.1.3 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r2.2.2.2]][P[o0x02][p1.1.1.1/32]]/488
172.16.1.3 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r2.2.2.2]][P[o0x02][p2.2.2.2/32]]/488
172.16.1.3 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r3.3.3.3]][P[o0x01][p10.2.2.0/24]]/480
172.16.1.3 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r3.3.3.3]][P[o0x01][p10.4.4.0/24]]/480
172.16.1.3 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r3.3.3.3]][P[o0x01][p3.3.3.3/32]]/488
172.16.1.3 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r4.4.4.4]][P[o0x01][p10.3.3.0/24]]/480
172.16.1.3 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r4.4.4.4]][P[o0x01][p10.4.4.0/24]]/480
172.16.1.3 100 0 i
*>i[T][O][I0x1][N[c100][b0.0.0.0][a0.0.0.1][r4.4.4.4]][P[o0x01][p4.4.4.4/32]]/488
172.16.1.3 100 0 i
Processed 33 prefixes, 33 paths
SR-TE DBの状態確認
R5のSR-TE DBを見ると、エリア0とエリア1のTE用の情報を学習していることが確認できます。
R5
RP/0/RP0/CPU0:R5#show pce ipv4 topology traffic-eng 2.2.2.2
PCE's topology database - detail:
---------------------------------
Node 2
TE router ID: 2.2.2.2
OSPF router ID: 2.2.2.2 area ID: 0 ASN: 100 domain ID: 1
OSPF router ID: 2.2.2.2 area ID: 1 ASN: 100 domain ID: 1
Prefix SID:
OSPF router ID: 2.2.2.2 area ID: 0 ASN: 100 domain ID: 1
Prefix 2.2.2.2, label 20201 (regular), flags: N:1, R:0, P:0, V:0, E:0, L:0
SRGB INFO:
OSPF router ID: 2.2.2.2 area ID: 0 ASN: 100 domain ID: 1
SRGB Start: 16000 Size: 8000
OSPF router ID: 2.2.2.2 area ID: 1 ASN: 100 domain ID: 1
SRGB Start: 16000 Size: 8000
Link[0]: local address 10.1.1.2, remote address 10.1.1.1
Local node:
OSPF router ID: 2.2.2.2 area ID: 0 ASN: 100 domain ID: 1
Remote node:
TE router ID: 1.1.1.1
OSPF router ID: 1.1.1.1 area ID: 0 ASN: 100 domain ID: 1
Metric: IGP 1, TE 1, Latency 1 microseconds
Bandwidth: Total 125000000 Bps, Reservable 0 Bps
Admin-groups: 0x00000001
Adj SID: 24000 (unprotected)
Link[1]: local address 10.2.2.2, remote address 10.2.2.3
Local node:
OSPF router ID: 2.2.2.2 area ID: 1 ASN: 100 domain ID: 1
Remote node:
TE router ID: 3.3.3.3
OSPF router ID: 3.3.3.3 area ID: 1 ASN: 100 domain ID: 1
Metric: IGP 1, TE 1, Latency 1 microseconds
Bandwidth: Total 125000000 Bps, Reservable 0 Bps
Admin-groups: 0x00000002
Adj SID: 24001 (unprotected)
Link[2]: local address 10.3.3.2, remote address 10.3.3.4
Local node:
OSPF router ID: 2.2.2.2 area ID: 1 ASN: 100 domain ID: 1
Remote node:
TE router ID: 4.4.4.4
OSPF router ID: 4.4.4.4 area ID: 1 ASN: 100 domain ID: 1
Metric: IGP 1, TE 1, Latency 1 microseconds
Bandwidth: Total 125000000 Bps, Reservable 0 Bps
Admin-groups: 0x00000001
Adj SID: 24002 (unprotected)
PCEを使用しない場合
SR-TE Policyの設定
R1でEnd-pointが3.3.3.3、かつ、Color REDのリンクのみを使用するSR-TE Policyを設定します。PCEにはLSPの計算は依頼しません。
R1
segment-routing
traffic-eng
policy SR-TE_POLICY
color 1 end-point ipv4 3.3.3.3
candidate-paths
preference 10
dynamic
!
constraints
affinity
include-any
name RED
SR-TE Policyの状態確認
R1はエリア1のリンクの情報を知らないため、SR-TEのLSPの計算に失敗していることが確認できます。
R1
RP/0/RP0/CPU0:R1#show segment-routing traffic-eng policy
SR-TE policy database
---------------------
Color: 1, End-point: 3.3.3.3
Name: srte_c_1_ep_3.3.3.3
Status:
Admin: up Operational: down for 00:21:55 (since Jun 28 08:40:47.686)
Candidate-paths:
Preference: 10 (configuration)
Name: SR-TE_POLICY
Requested BSID: dynamic
Constraints:
Affinity:
include-any:
RED
Maximum SID Depth: 10
Dynamic (invalid)
Last error: No path found
Metric Type: TE, Path Accumulated Metric: 0
Attributes:
Forward Class: 0
Steering labeled-services disabled: no
Steering BGP disabled: no
IPv6 caps enable: no
PCEを使用した場合
SR-TE Policyの設定
R1でEnd-pointが3.3.3.3、かつ、Color REDのリンクのみを使用するSR-TE Policyを設定します。また、PCEにLSPの計算を依頼します。
R1
segment-routing
traffic-eng
policy SR-TE_POLICY
color 1 end-point ipv4 3.3.3.3
candidate-paths
preference 10
dynamic
pcep
!
constraints
affinity
include-any
name RED
PCEの状態確認
R5はBGP-LS経由で学習したOSPFのエリア0とエリア1のLSAの情報を基に、エリア0からエリア1に跨るLSPを計算できていることが確認できます。
R5
RP/0/RP0/CPU0:R5#show pce lsp detail
PCE's tunnel database:
----------------------
PCC 172.16.1.1:
Tunnel Name: cfg_SR-TE_POLICY_discr_10
Color: 1
Interface Name: srte_c_1_ep_3.3.3.3
LSPs:
LSP[0]:
source 1.1.1.1, destination 3.3.3.3, tunnel ID 4, LSP ID 1
State: Admin up, Operation up
Setup type: Segment Routing
Binding SID: 24002
Maximum SID Depth: 10
Preference: 10
Bandwidth: signaled 0 kbps, applied 0 kbps
Affinity: exclude-any 0x0 include-any 0x1 include-all 0x0
PCEP information:
PLSP-ID 0x3, flags: D:1 S:0 R:0 A:1 O:1 C:0
LSP Role: Single LSP
State-sync PCE: None
PCC: 172.16.1.1
LSP is subdelegated to: None
Reported path:
Metric type: TE, Accumulated Metric 3
SID[0]: Node, Label 20201, Address 2.2.2.2
SID[1]: Node, Label 20401, Address 4.4.4.4
SID[2]: Node, Label 20301, Address 3.3.3.3
Computed path: (Local PCE)
Computed Time: Sun Jun 28 09:05:05 UTC 2020 (00:00:13 ago)
Metric type: TE, Accumulated Metric 3
SID[0]: Node, Label 20201, Address 2.2.2.2
SID[1]: Node, Label 20401, Address 4.4.4.4
SID[2]: Node, Label 20301, Address 3.3.3.3
Recorded path:
None
Disjoint Group Information:
None
SR-TE Policyの状態確認
R1はR5からエリア0からエリア1に跨るLSPを学習していることが確認できます。
R1
RP/0/RP0/CPU0:R1#show segment-routing traffic-eng policy
SR-TE policy database
---------------------
Color: 1, End-point: 3.3.3.3
Name: srte_c_1_ep_3.3.3.3
Status:
Admin: up Operational: up for 00:00:56 (since Jun 28 09:04:38.052)
Candidate-paths:
Preference: 10 (configuration) (active)
Name: SR-TE_POLICY
Requested BSID: dynamic
PCC info:
Symbolic name: cfg_SR-TE_POLICY_discr_10
PLSP-ID: 3
Constraints:
Affinity:
include-any:
RED
Maximum SID Depth: 10
Dynamic (pce 172.16.1.5) (valid)
Metric Type: TE, Path Accumulated Metric: 3
20201 [Prefix-SID, 2.2.2.2]
20401 [Prefix-SID, 4.4.4.4]
20301 [Prefix-SID, 3.3.3.3]
Attributes:
Binding SID: 24002
Forward Class: Not Configured
Steering labeled-services disabled: no
Steering BGP disabled: no
IPv6 caps enable: yes
疎通確認
R1の1.1.1.1からR3の3.3.3.3へTracerouteを実施します。
パケットがColor REDのリンクのみ経由していることが確認できます。
R1
RP/0/RP0/CPU0:R1#traceroute 10.5.5.3 source 1.1.1.1
Type escape sequence to abort.
Tracing the route to 10.5.5.3
1 10.1.1.2 [MPLS: Labels 20401/20301 Exp 0] 28 msec 33 msec 19 msec
2 10.3.3.4 [MPLS: Label 20301 Exp 0] 19 msec 18 msec 21 msec
3 10.4.4.3 19 msec * 16 msec
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