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©200
7 C
isco
Syste
ms,
Inc. A
ll righ
ts r
ese
rved
.P
ow
erP
oin
t T
em
pla
te T
ip: B
ulle
ts v
2.6
—1
Cis
co
Resili
en
t E
the
rne
t P
roto
co
l (R
EP
)
Dubro
vnik
, 21.3
.2008.
DejanJaksic,
Systems Engineer,
©200
7 C
isco
Syste
ms,
Inc. A
ll righ
ts r
ese
rved
.P
ow
erP
oin
t T
em
pla
te T
ip: B
ulle
ts v
2.6
—2
Re
sil
ien
t E
the
rne
t P
roto
co
l (R
EP
)W
ha
t is
RE
P?
•C
isco
Res
ilie
nt
Eth
ern
et
Pro
toco
lis
a n
ew
tech
no
log
y
that
exte
nd
s n
etw
ork
resilie
ncy a
cro
ss C
isco
IP
Next-
Gen
era
tio
n N
etw
ork
(N
GN
) C
arr
ier
Eth
ern
et
Desig
n.
•D
esig
ned
to
meet
fast
co
nverg
en
ce r
eq
uir
em
en
t in
la
yer
2 d
om
ain
s, in
part
icu
lar
for
rin
g t
op
olo
gie
s.
•Im
ple
men
ted
on
Cis
co
Carr
ier
Eth
ern
et
pla
tfo
rms a
s a
so
ftw
are
up
date
. R
eq
uir
es n
o h
ard
ware
up
gra
des.
©200
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isco
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ll righ
ts r
ese
rved
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erP
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t T
em
pla
te T
ip: B
ulle
ts v
2.6
—3
Re
sil
ien
t E
the
rne
t P
roto
co
lR
EP
be
ne
fits
Vo
ice
Vid
eo
Da
ta
RE
P
RE
P
Ag
gre
ga
tio
nM
PL
S F
RR
/ R
EP
ME
3400
3750 M
etr
o
Eq
ual
Access
Larg
e S
cale
Ag
gre
gati
on
RE
P D
iffe
ren
tiato
rs
To
po
log
y A
gn
osti
c
(Rin
g,
Sta
r)
Scala
ble
Dete
rmin
isti
c F
ail
over
(50
ms)
Ban
dw
idth
Op
tim
izati
on
(V
LA
N L
oad
Bala
ncin
g)
Co
-Exis
ts w
ith
ST
P
©200
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isco
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pla
te T
ip: B
ulle
ts v
2.6
—4
Re
sil
ien
t E
the
rne
t P
roto
co
l (R
EP
)R
EP
Be
ne
fits
( M
ore
de
tail
s)
•Fast
an
d p
red
icta
ble
co
nverg
en
ce in
rin
g t
op
olo
gy
–C
on
verg
en
ce
tim
e:
50m
s i
n m
ost
co
nd
itio
ns
•D
ete
rmin
isti
c a
nd
scala
ble
–F
ast
fail
ure
no
tifi
cati
on
eve
n i
n l
arg
e r
ing
s w
ith
hig
h n
um
ber
of
no
de
–A
lte
rnate
po
rt S
ele
cti
on
au
tom
ati
c o
r u
ser
co
nfi
gu
rab
le
•Op
tim
al b
an
dw
idth
uti
lizati
on
wit
h V
LA
N L
oad
Bala
ncin
g
•S
pan
nin
g T
ree C
oexis
ten
ce
–L
imit
th
e s
co
pe o
f S
pan
nin
g-t
ree
–S
TP
is d
eacti
vate
d o
n R
EP
in
terf
ace
s
–T
op
olo
gy C
han
ges n
oti
ficati
on
fo
rward
ed
to
Sp
an
nin
g T
ree
•E
as
y t
o c
on
fig
ure
an
d t
rou
ble
sh
oo
t
–T
op
olo
gy a
rch
ivin
g f
or
eas
y t
rou
ble
sh
oo
tin
g
–K
no
wn
fix
ed
to
po
log
y w
ith
pre
em
pti
on
mech
an
ism
s
–S
imp
le m
ech
an
ism
to
setu
p t
he A
ltern
ate
Po
rt (
blo
ckin
g p
ort
)
©200
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isco
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em
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te T
ip: B
ulle
ts v
2.6
—5
Co
nn
ec
tin
g t
he
se
gm
en
t to
th
e n
etw
ork
.
Eth
erc
ha
nn
el
RE
P
Se
gm
en
t
Sp
an
nin
g T
ree
L3
Do
ma
inA
BC
D
EF
GH
•The s
egm
ent edges c
an
be c
onnecte
d to a
ny
netw
ork
without cre
ating
bridgin
g loops.
•T
he lin
k b
etw
een the
edge n
odes is the c
om
mon
link.
•C
om
mon o
ptions for
Com
mon L
ink H
A a
re S
TP
, E
therc
hannel or
RE
P.
©200
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isco
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ms,
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ll righ
ts r
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rved
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oin
t T
em
pla
te T
ip: B
ulle
ts v
2.6
—6
Resilie
nt
Eth
ern
et
Pro
toco
lR
EP
is a
Seg
men
t P
roto
co
l
Port
s a
re e
xp
licitly
configure
d t
o b
e p
art
of a
segm
ent.
When a
ll th
e lin
ks in t
he s
egm
ent
are
opera
tiona
l, a
blo
cke
d p
ort
is d
ete
rmin
ed s
o t
hat th
ere
is n
o
conn
ectivity b
etw
een t
he e
dg
es A
,B thro
ugh t
he
segm
ent
If a
failu
re o
ccurs
with
in t
he s
eg
ment, the b
locked p
ort
goes f
orw
ard
ing
AB
AB
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isco
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ll righ
ts r
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rved
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em
pla
te T
ip: B
ulle
ts v
2.6
—7
Resilie
nt
Eth
ern
et
Pro
toco
l R
EP
Red
un
dan
cy O
pti
on
s
When w
rapped into
a r
ing,
the R
EP
segm
ent can a
lso p
rovid
e r
edundant connectivity
betw
een
an
y t
wo
sw
itches
A c
om
bin
ation o
f rings a
nd s
egm
ents
allo
ws c
reating a
lmost an
y k
ind o
f ne
twork
.
AB
AB
The s
egm
ent
pro
vid
es r
edundancy t
o t
he h
osts
within
its
boundaries: th
ey c
an r
each
th
e r
est o
f th
e n
etw
ork
thro
ugh
either
A o
r B
.
The s
egm
ent
will
*not*
unblo
ck to c
over
a failu
re o
uts
ide o
f its
boundaries.
BA
x
BA
x
Bridged
dom
ain
Bridged
dom
ain
Host
Redundancy
Lin
k
Redundancy
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ip: B
ulle
ts v
2.6
—8
Re
sil
ien
t E
the
rne
t P
roto
co
lF
lex
ibil
ity i
n s
up
po
rtin
g v
ari
ou
s t
op
olo
gie
s
Seg
men
t 2
Seg
men
t 1
Seg
men
t 3
Seg
men
t 3
Seg
men
t 1
Seg
men
t 2
AD
BC
E F
G
H
I
JK L
A
B CD
E
F
G
HI
J
K
L
M
Bridged
dom
ain
Access a
nd A
ggre
gation r
ings
Sub-t
endin
g r
ings term
inate
d o
n
diffe
rent rings
©200
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isco
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ll righ
ts r
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em
pla
te T
ip: B
ulle
ts v
2.6
—9
Re
sil
ien
t E
the
rne
t P
roto
co
l –
Op
tim
ized
ban
dw
idth
Uti
lizati
on
wit
h V
lan
Lo
ad
Bala
ncin
g
•A
s f
or
Spannin
g T
ree M
ST
, V
LA
N loa
d b
ala
ncin
g p
er
VL
AN
insta
nces
•VLA
Ns g
rou
pe
d into
tw
o insta
nces
•Load b
ala
nce
traff
ic a
cro
ss t
he s
egm
ent
per
VLA
N g
rou
ps.
•F
irst
gro
up o
f V
LA
N b
locked a
t th
e
Pre
ferr
ed p
ort
. P
refe
rred P
ort
user
sele
cta
ble
.
•S
econd g
roup o
f V
LA
N b
locked a
t th
e p
rim
ary
ed
ge p
ort
.
•B
oth
port
s u
nb
lock w
he
n a
lin
k f
ails
in t
he s
egm
ent.
©200
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isco
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ll righ
ts r
ese
rved
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oin
t T
em
pla
te T
ip: B
ulle
ts v
2.6
—10
Re
sil
ien
t E
the
rne
t P
roto
co
lE
as
e o
f U
se
an
d t
rou
ble
sh
oo
tin
g
•T
opolo
gy C
olle
ction p
roto
col to
colle
ct
Top
olo
gy info
rmation
•T
opolo
gy a
rchiv
ing o
ption t
o
report
pre
vio
us s
tate
in the r
ing.
•R
esto
ratio
n t
o a
well
kno
wn s
tate
w
ith p
reem
ption d
ela
y
•Resili
ent
Eth
ern
et
pro
toco
l M
IB f
or
SN
MP
man
agem
ent
©200
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isco
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ll righ
ts r
ese
rved
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oin
t T
em
pla
te T
ip: B
ulle
ts v
2.6
—11
RE
P a
nd
Sp
an
nin
g T
ree
Ea
sy m
igra
tio
n a
nd
Co
-ex
iste
nc
e
•Com
patib
le a
nd c
om
ple
menta
ry
with s
tandard
IE
EE
802.1
span
nin
g-t
ree p
roto
co
ls
•Cis
co R
EP
and S
pan
nin
g T
ree
Pro
tocol ca
n c
oe
xis
t on t
he
sam
e s
witch.
•RE
P c
an n
otify
the S
pann
ing
Tre
e P
roto
col ab
out
pote
ntia
l to
polo
gy c
han
ges (
TC
Ns).
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isco
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ll righ
ts r
ese
rved
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oin
t T
em
pla
te T
ip: B
ulle
ts v
2.6
—12
Re
sil
ien
t E
the
rne
t P
roto
co
l E
ffic
ien
t L
ink
fa
ilu
re N
oti
fic
ati
on
Ed
ge
Sw
itch
Op
en
Alt
ern
ate
Po
rt
Fa
ile
d
Op
en
Op
en
Op
en
Op
en
Sw
itch
C
Sw
itch
D
Op
en
Op
en
Fa
ile
d
Flo
od
ed
Flo
od
ed
Flo
od
ed
Flo
od
ed
Flo
od
ed
•D
istr
ibute
d P
roto
col: A
ny R
EP
port
can initia
te a
sw
itchover
as
long a
s it
has p
revio
usly
acqu
ire
d a
secure
key t
o u
nblo
ck t
he a
ltern
ate
port
.
•Usin
g a
Cis
co M
ultic
ast addre
ss,
the n
otificatio
n is f
orw
ard
ed in
hard
ware
so t
hat each
node in t
he
segm
ent
is n
otifie
d im
media
tely
w
ithout
softw
are
invo
lvem
ent
from
any n
od
e.
Lin
k F
ail
ure
n
oti
fic
ati
on
Lin
k F
ail
ure
n
oti
fic
ati
on
©200
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isco
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ts r
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rved
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oin
t T
em
pla
te T
ip: B
ulle
ts v
2.6
—13
Re
sil
ien
t E
the
rne
t P
roto
co
l (R
EP
) W
ha
t R
EP
is
no
t m
ea
nt
to d
o:
RE
P D
oes n
ot
�D
oes
no
t p
rote
ct
ag
ain
st
du
al fa
ilu
re in
th
e r
ing
©200
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isco
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ts r
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em
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te T
ip: B
ulle
ts v
2.6
—14
Qu
esti
on
s?
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isco
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ll righ
ts r
ese
rved
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oin
t T
em
pla
te T
ip: B
ulle
ts v
2.6
—15
Re
sil
ien
t E
the
rne
t P
roto
co
l P
re-e
mp
tio
n
Fo
r a
uto
ma
tic
re
sto
rati
on
to
a w
ell k
no
wn
sta
te
Alt
ern
ate
P
ort
Pre
ferr
ed
A
lte
rna
te
Po
rt
Pri
mary
E
dg
e P
ort
Seco
nd
ary
Ed
ge P
ort
Pre
ferr
ed
A
ltern
ate
P
ort
Wit
h p
re-e
mp
tio
n d
ela
yM
an
ual
Tri
gg
er
OR
3750-1
#re
p p
reem
pt
seg
men
t 1
Th
e c
om
man
d w
ill cau
se a
mo
men
tary
tra
ffic
dis
rup
tio
n.
Do
yo
u s
till w
an
t to
co
nti
nu
e?
[co
nfi
rm]
Pro
ceed
ing
wit
h M
an
ual P
reem
pti
on
Sw
itch(c
onfig-if)
# r
ep
pre
em
pt
dela
y 1
Aft
er
failu
re r
ep
air
Man
ually
Alt
ern
ate
P
ort
Pre
ferr
ed
A
lte
rna
te
Po
rt
Alt
ern
ate
P
ort
Pre
ferr
ed
A
lte
rna
te
Po
rt
Pre
-em
pti
on
dela
y:
15 s
ec.
to 3
00 s
ec.
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te T
ip: B
ulle
ts v
2.6
—16